1
                                             Filed by Orthodontic Centers of
                                             America, Inc. pursuant to Rule 425
                                             under the Securities Act of 1933
                                             and deemed filed pursuant to Rule
                                             14a-12 under the Securities
                                             Exchange Act of 1934.

                                             Subject Company: Orthodontic
                                             Centers of America, Inc.
                                             Commission File No.: 1-13457

         THE FOLLOWING ARE MATERIALS USED IN A PRESENTATION TO PRACTITIONERS
AFFILIATED WITH ORTHALLIANCE.

         THE EXAMPLES AND/OR CALCULATIONS INCLUDED IN THIS PRESENTATION ARE
SOLELY FOR ILLUSTRATION PURPOSES AND MAY NOT BE REPRESENTATIVE OF ALL PRACTICES.
ACTUAL RESULTS COULD VARY FROM THESE EXAMPLES.


                              OrthAlliance Doctor

                              Financial Incentives



   2
                           Merger Options & Key Terms


o     Existing Contract: (no change)

o     Amendment to Existing Contract:
      3 year min. commitment
      Convert to OCA business systems

o     OCA Standard Contract:
      3 year min. commitment
      Replacement doctor required prior to departure
      Doctor retains proceeds from sale
      Convert to OCA business systems
      Fee based on Profit
      Share allocable corporate expenses
      Share operating losses and fixed asset costs

   3
                        Merger Options & Key Incentives

o     Existing Contract: (no change)
      Exchange of OrthAlliance stock for OCA stock.

o     Amendment to Existing Contract:
      Stock Pool
      Target Program

o     OCA Standard Contract:
      Stock Pool
      Target Program
      Contract Conversion
      Doctors Trust
   4
                      Exchange of ORAL Stock for OCA Stock

o     OCA stock - $30.70 as of 5/31/2001

      -     NYSE-traded

      -     Institutional ownership: 80%

      -     Liquid, valuable currency

o     Exchange ratio: 0.09214 to 0.16585

o     Example: 100,000 shares times .12899 equals 12,899 shares. At $30/share
      equals $386,970.

   5

                             Investment Comparison
                             July 1998 to May 2001

              [CHART OF THE PERFORMANCE OF OCA'S COMMON STOCK AND
          THAT OF OTHER DENTAL OR PHYSICIAN PRACTICE MANAGEMENT COMPANIES
                          FROM JULY 1998 TO MAY 2001]


   6


                        Merger Options & Key Incentives


o        Existing Contract: (no change)
         Exchange of OrthAlliance Stock for OCA stock.

o        Amendment to Existing Contract:
         Stock Pool
         Target Program

o        OCA Standard Contract:
         Stock Pool
         Target Program
         Contract Conversion
         Doctors Trust
   7

                                 OCA Stock Pool

o     Potential $13,500,000 of stock at $30.

o     Commitment by July 27, 2001

o     Stock issuance based on:

      - Timing of commitment (amendment or OCA contract)

      - Size of Practice (management fee based)

      - Tenure with PPM


   8
                                Stock Pool Rules

o    Tenure: 10 shares/ month for each month contracted w/PPM.

o    Size:   30 shares/ $10,000 of annual fees as of 3/31/01.

o    Timing: sign amendment or OCA Contract

     Group 1 - by June 15, 2001 - receive 900 OCA shares

     Group 2 - by June 22, 2001 - receive 800 OCA shares

     Group 3 - by June 29, 2001 - receive 700 OCA shares

     Group 4 - by July 6, 2001 - receive 600 OCA shares

     Group 5 - by July 13, 2001 - receive 500 OCA shares

     Group 6 - by July 20, 2001 - receive 400 OCA shares

     Group 7 - by July 27, 2001 - receive 300 OCA shares

     plus 200 additional shares for every 20 doctors signed
     before July 27, 2001 and after your commitment group.
   9
                             OCA Stock Pool Example

o     $195,000 annual fees = 585 OCA shares

o     40 months = 400 OCA shares

o     Commitment by June 15, 2001 = 900 OCA shares

o     127 doctor total commitment = 600 OCA shares
      (assumes 60 doctors in group 1)

o     Therefore total issuance = 2,485 OCA shares for this example with a value
      of $74,550 @ $30/share.

o     Stock vesting: 1/3 at end of each year for three years.
   10
                        Merger Options & Key Incentives


o     Existing Contract: (no change)
      Exchange of OrthAlliance stock for OCA stock.

o     Amendment to Existing Contract:
      Stock Pool
      Target Program

o     OCA Standard Contract:
      Stock Pool
      Target Program
      Contract Conversion
      Doctors Trust



   11

                                 Target Program
                             OrthAlliance Contract



                            Existing Contract     Existing Contract
                            -----------------     -----------------
                                         
Gross                           $1,000,000            $1,500,000
Margins                              50.00%                60.00%
                                ----------            ----------

Doctor income                   $  330,000            $  645,000
Service Fee        17%          $  170,000            $  255,000
                                ----------            ----------
Service fee increase                                  $   85,000
Multiple                                                    3.00
                                                      ----------
Value issued to doctor
  for growth                                          $  255,000
                                                      ==========


Stock vesting: 25% after 2 years; 25% per year thereafter.
Max value: 3 times 70% of service fee (12 months before merger).
   12
                        Merger Options & Key Incentives


o        Existing Contract: (no change)
         Exchange of OrthAlliance stock for OCA stock.

o        Amendment to Existing Contract:
         Stock Pool
         Target Program

o        OCA Standard Contract:
         Stock Pool
         Target Program
         Contract Conversion
         Doctors Trust
   13


                           Conversion to OCA Contract





                                        OrthAlliance           OCA
                                          Contract           Contract
                                        ------------       ------------

                                                     
Gross                                   $  1,000,000       $  1,000,000
Margins                                        50.00%             55.00%
Percent to Orthalliance                        17.00%
Percentage of profit, standard OCA                                40.00%


Doctor income                           $    330,000       $    330,000
Annual fee to management                $    170,000       $    220,000

Difference in fee to OCA                                   $     50,000
Multiple                                                           4.00
                                                           ------------

Share value issued to doctor                               $    200,000
                                                           ============


4X multiple available until July 27, 2001.
Vesting: 25% after 2 years; 25% per year thereafter.

   14
                                 Target Program
                                  OCA Contract





                                           After
                                         Conversion          3rd year
                                             to               After
                                        OCA Contract       OCA Contract
                                        ------------       ------------
                                                    
Gross                                    $1,000,000         $1,500,000
Margins                                       55.00%             60.00%


Doctor income 60%                        $  330,000         $  540,000
OCA fee 40%                              $  220,000         $  360,000

Service fee increase                                        $  140,000
Multiple                                                          3.00
                                                            ----------

Value issued to doctor for growth                           $  420,000
                                                            ==========


Stock vesting: 25% after 2 years; 25% per year thereafter.
Max value: 3 times 70% of service fee (12 months before merger).
   15
                        Merger Options & Key Incentives


o    Existing Contract: (no change)
     Exchange of OrthAlliance stock for OCA stock.

o    Amendment to Existing Contract:
     Stock Pool
     Target Program

o    OCA Standard Contract:
     Stock Pool
     Target Program
     Contract Conversion
     Doctors Trust
   16


                           OCA Doctors Trust Program



                                                                  
Annual purchase price                                                $   4,000
Period of years                                                             10
Multiple given                                                            15.0
Current stock value                                                  $  60,000


Requirements:
    10 year commitment by doctor.
    Sale of practice to OCA qualified Orthodontist during vesting period.
    Doctor has two year option to purchase stock under Trust Program.

Restrictions:
    No sale until year 11, stock issuance over 7 years from year 11.



   17

                           Example of OCA Total Value




                                         Existing Contract          OCA Contract
                                         -----------------          -------------
                                                              
Stock from OCA Stock Pool                $          75,000          $      75,000
Stock from Target                        $         255,000          $     420,000
Stock for Signing OCA Contract           $              --          $     200,000
Stock from Trust                         $              --          $      60,000
                                         -----------------          -------------
Stock Total                              $         330,000          $     755,000

Annual After-tax cash flow               $         387,000          $     324,000

   18

                               Summary of Benefits


o     Exchange of OrthAlliance Stock

o     OCA Stock Pool

o     Achieving Growth Targets

o     Conversion to OCA contract

o     OCA Doctor Trust Program

   19

                      ORTHODONTIC CENTERS OF AMERICA, INC.

            INCENTIVE PROGRAMS FOR ORTHALLIANCE ALLIED PRACTITIONERS


         Orthodontic Centers of America, Inc. ("OCA") is a party with
OrthAlliance, Inc. ("OrthAlliance") to an Agreement and Plan of Merger, dated
May 16, 2001 (the "Merger Agreement"), which provides for the merger of one of
OCA's wholly-owned subsidiaries with and into OrthAlliance, with OrthAlliance
becoming a wholly-owned subsidiary of OCA (the "Merger"). Completion of this
proposed Merger is subject to a number of conditions, including approval of the
Merger Agreement by OrthAlliance stockholders. Additional information about this
proposed Merger may be obtained from a Registration Statement on Form S-4, and a
related prospectus/proxy statement, that OCA will file with the Securities and
Exchange Commission in connection with the proposed Merger.

         In connection with the proposed Merger, OCA has implemented four
programs under which it may offer shares of its common stock to orthodontists
and pediatric dentists who are owners and employees ("OrthAlliance Affiliated
Practitioners") of professional entities that are parties to service, management
services, consulting or similar long-term agreements ("OrthAlliance Service or
Consulting Agreements") with OrthAlliance and its subsidiaries. Two of these
programs provide incentives to OrthAlliance Affiliated Practitioners who, along
with their respective professional entities, either (a) amend their respective
employment agreement and OrthAlliance Service or Consulting Agreement as
contemplated by Sections 2.4 and 7.2(e) of the Merger Agreement, or (b) enter
into OCA's customary form of business services agreement with OCA or its
subsidiaries ("OCA Business Services Agreement"), in replacement of their
existing OrthAlliance Service or Consulting Agreement, effective as of the
proposed Merger with OrthAlliance. The other two programs provide incentives
only to those OrthAlliance Affiliated Practitioners who, along with their
respective professional entities, enter into an OCA Business Services Agreement
effective as of the proposed Merger. Each of these programs would be conditioned
upon, and subject to, completion of the proposed Merger and compliance with
federal and state securities laws.

         The amendments to employment agreements and OrthAlliance Service or
Consulting Agreement contemplated by Sections 2.4 and 7.2(e) of the Merger
Agreement would generally involve the following:

         o AMENDMENT TO EMPLOYMENT AGREEMENT. In the amendment to their
respective employment agreement, the OrthAlliance Affiliated Practitioner and
his or her professional entity would agree to include OrthAlliance as a third
party beneficiary and continue the OrthAlliance Affiliated Practitioner's
employment as an orthodontist or pediatric dentist, as applicable, for a period
of at least three years following the proposed Merger.

         o AMENDMENT TO SERVICE OR CONSULTING AGREEMENT In the amendment to
their respective OrthAlliance Service or Consulting Agreement, the OrthAlliance
Affiliated Practitioner and his or her professional entity would agree to use
OCA's proprietary computer software and business systems in connection with the
business functions of their practice, maintain the current status of the
advertisement or non-advertisement, as the case may be, of their practice to the
general public, unless OCA otherwise agrees, and continue the OrthAlliance
Affiliated Practitioner's employment as an orthodontist or pediatric dentist, as
applicable, for a period of at least three years following the proposed Merger.


   20


         PLEASE NOTE THAT THIS DOES NOT CONSTITUTE AN OFFER OF ANY SECURITIES
FOR SALE, NOR THE SOLICITATION OF AN OFFER TO BUY ANY SECURITIES. OCA
ANTICIPATES THAT IT WILL FILE A REGISTRATION STATEMENT WITH THE SECURITIES AND
EXCHANGE COMMISSION RELATING TO THE SHARES OF OCA COMMON STOCK THAT WOULD BE
ISSUED UNDER THESE PROGRAMS. THAT REGISTRATION STATEMENT HAS NOT YET BEEN FILED
OR BECOME EFFECTIVE. THOSE SHARES OF OCA COMMON STOCK MAY NOT BE SOLD, AND ANY
OFFERS TO BUY THE SHARES MAY NOT BE ACCEPTED, UNTIL THE REGISTRATION STATEMENT
BECOMES EFFECTIVE, AND ANY SUCH OFFER MAY BE WITHDRAWN OR REVOKED, WITHOUT
OBLIGATION OR COMMITMENT OF ANY KIND, AT ANY TIME PRIOR TO NOTICE OF ACCEPTANCE
GIVEN AFTER THE EFFECTIVE DATE OF THE REGISTRATION STATEMENT. ANY INDICATION OF
INTEREST IN RESPONSE TO THIS COMMUNICATION WILL INVOLVE NO OBLIGATION OR
COMMITMENT. NO SECURITIES WILL BE SOLD OR GRANTED IN ANY JURISDICTION IN WHICH
THE OFFER, SOLICITATION OR SALE OF SUCH SECURITIES WOULD BE UNLAWFUL PRIOR TO
REGISTRATION OR QUALIFICATION UNDER THE SECURITIES LAWS OF SUCH JURISDICTION.




                                       2
   21



INCENTIVES FOR AMENDING EXISTING EMPLOYMENT AGREEMENT AND ORTHALLIANCE
AGREEMENT, OR ENTERING INTO NEW OCA AGREEMENT

         OCA may offer shares of its common stock to OrthAlliance Affiliated
Practitioners as an incentive for these individuals and their professional
entities to, prior to the Merger, either (a) amend their existing employment
agreement and OrthAlliance Service or Consulting Agreement, as contemplated by
Sections 2.4 and 7.2(e) of the Merger Agreement, or (b) enter into an OCA
Business Services Agreement in replacement of their existing OrthAlliance
Service or Consulting Agreement, effective as of the proposed Merger with
OrthAlliance. These shares may be issued to eligible OrthAlliance Affiliated
Practitioners generally on the following terms under OCA's:

         o        Stock Pool Program; and


         o        Target Stock Program.


1.       STOCK POOL PROGRAM

         Under OCA's Stock Pool Program, OCA may grant shares of its common
stock to eligible OrthAlliance Affiliated Practitioners who, along with their
professional entity, no later than July 27, 2001, either (1) amend their
existing employment agreement and OrthAlliance Service or Consulting Agreement,
as contemplated by Sections 2.4 and 7.2(e) of the Merger Agreement, or (2) enter
into an OCA Business Services Agreement effective as of the Merger, as follows:

         ANNUAL SERVICE FEE/TENURE BASED AMOUNT. Shares in an amount equal to
         the greater of 500 or:

         (a)      ANNUAL SERVICE FEE BASED AMOUNT. 30 shares for each $10,000 of
                  service, consulting or management fees (excluding any center
                  or other expense reimbursement) paid by the OrthAlliance
                  Affiliated Practitioner or his or her professional entity to
                  OrthAlliance or its subsidiaries during the period from April
                  1, 2000 through March 31, 2001 (with certain adjustments and
                  annualization as described in Section 2.4 of the Merger
                  Agreement), rounded to the nearest whole number,

                  PLUS

         (b)      TENURE BASED AMOUNT. 10 shares for each whole calendar month
                  elapsed during the term of their OrthAlliance Service or
                  Consulting Agreement as of March 31, 2001.

         TIMING BASED AMOUNT. An additional number of shares for the first 180
         OrthAlliance Affiliated Practitioners who either (1) amend their
         existing employment agreement and OrthAlliance Service or Consulting
         Agreement, as contemplated by Sections 2.4 and 7.2(e) of the Merger
         Agreement, or (2) enter into an OCA Business Services Agreement
         effective as of the Merger, within specified time limits as described
         below. For those OrthAlliance Affiliated Practitioners who do so:

         o        By June 15, 2001:

                  (i)      900 shares,

                           PLUS



                                       3


   22


                  (ii)     200 shares for each additional 20 of those
                           OrthAlliance Affiliated Practitioners who do so from
                           June 16 - July 27, 2001.

         o        June 16 - 22, 2001:

                  (i)      800 shares,

                           PLUS

                  (ii)     200 shares for each additional 20 of those
                           OrthAlliance Affiliated Practitioners who do so from
                           June 23 - July 27, 2001.

         o        June 23 - 29, 2001:

                  (i)      700 shares,

                           PLUS

                  (ii)     200 shares for each additional 20 of those
                           OrthAlliance Affiliated Practitioners who do so from
                           June 30 - July 27, 2001.

         o        June 30 - July 6, 2001:

                  (i)      600 shares,

                           PLUS

                  (ii)     200 shares for each additional 20 of those
                           OrthAlliance Affiliated Practitioners who do so from
                           July 7 - 27, 2001.

         o        July 7 - 13, 2001:

                  (i)      500 shares,

                           PLUS

                  (ii)     200 shares for each additional 20 of those
                           OrthAlliance Affiliated Practitioners who do so from
                           July 14 - 27, 2001.

         o        July 14 - 20, 2001:

                  (i)      400 shares,

                           PLUS

                  (ii)     200 shares for each additional 20 of those
                           OrthAlliance Affiliated Practitioners who do so from
                           July 21 - 27, 2001.

         o        July 21 - 27, 2001:

                  (i)      300 shares.

         CLINICAL ADVISORY COMMITTEE MEMBERS. In addition, each of the 12
OrthAlliance Affiliated Practitioners who are selected by OCA and OrthAlliance,
and agree, to serve on OCA's Clinical Advisory Committee upon the Merger may be
granted 2,500 shares of OCA common stock if, by June 8, 2001, that individual
and his or her professional entity (1) amend their existing employment agreement
and OrthAlliance Service or Consulting Agreement, as contemplated by Sections
2.4 and 7.2(e) of the Merger Agreement, or (2) enter into an OCA Business
Services Agreement effective as of the Merger.


                                       4
   23


         DATES OF GRANTS; CONDITION TO VESTING. Shares granted under this
program would be issuable in three annual installments, with one-third of the
shares to be issued following each of the first, second and third anniversaries
of the Merger if, during the 12 calendar months immediately preceding that
anniversary, the amount of service or consulting fees paid by the OrthAlliance
Affiliated Practitioner and his or her professional entity to OCA or its
subsidiary is at least 90% of the amount of service or consulting fees they paid
to OrthAlliance or its subsidiary during the 12 calendar months immediately
preceding the Merger.

         PRACTICES WITH MULTI-OWNERS. If an OrthAlliance Affiliated
Practitioner's professional entity is partially owned by one or more other
OrthAlliance Affiliated Practitioners, the number of shares to be granted based
on the amount of service or consulting fees paid would be computed on a pro rata
basis. In addition, the co-owner OrthAlliance Affiliated Practitioners would
have to execute and deliver the applicable amendments to their employment
agreement and OrthAlliance Service or Consulting Agreement, or new OCA Business
Services Agreement, as applicable, by July 27, 2001.

         ELIGIBILITY TO PARTICIPATE. To be eligible to participate in this
program, an OrthAlliance Affiliated Practitioner, along with his or her
professional entity, would have to, by the specified dates, either (1) amend
their existing employment agreement and OrthAlliance Service or Consulting
Agreement, as contemplated by Sections 2.4 and 7.2(e) of the Merger Agreement,
or (2) enter into an OCA Business Services Agreement in replacement of their
existing OrthAlliance Service or Consulting Agreement (effective as of the
Merger). Participation would also require the execution of a written
participation agreement between OCA and the OrthAlliance Affiliated Practitioner
that sets forth, or incorporates by reference, the terms of the program.
Participation in and the grant of any shares under this program would also be
conditioned upon, and subject to, completion of the Merger.

         In addition, to be eligible to participate in this program, an
OrthAlliance Affiliated Practitioner, along with his or her professional entity,
may not be a party to any pending or threatened litigation against OrthAlliance,
OCA or their subsidiaries, nor have given notice of termination or intention to
terminate their respective OrthAlliance Service or Consulting Agreement, and
must be in compliance with their obligation to pay service or consulting fees
under their OrthAlliance Service or Consulting Agreement. If such litigation or
notice has been commenced, threatened or given, it would need to have been
dismissed with prejudice or fully withdrawn in a manner acceptable to OCA.


                                       5
   24




2.       TARGET STOCK PROGRAM

         Under OCA's Target Stock Program, OCA may grant eligible OrthAlliance
Affiliated Practitioners shares of OCA common stock (except as described below)
as follows:

         NEW OCA AGREEMENT. For OrthAlliance Affiliated Practitioners who, along
with their respective professional entities, enter into an OCA Business Services
Agreement prior to the Merger (which would become effective upon the Merger),
OCA may issue them a number of shares of its common stock equal to:

         (a)      3,

                  TIMES

         (b)      70% OF ASSUMED SERVICE FEES IN PRIOR 12 MONTHS. 70% of the
                  amount of service or consulting fees (excluding any center or
                  other expense reimbursement) that would have been payable to
                  OCA or its subsidiary by the OrthAlliance Affiliated
                  Practitioner or his or her professional entity under the OCA
                  Business Services Agreement during the 12 calendar months
                  immediately preceding the Merger (assuming that the OCA
                  Business Services Agreement had been in effect during that
                  period and also assuming that the operating margin of the
                  practice during that period was 5% higher than the actual
                  operating margin for that period),

                  DIVIDED BY

         (c)      AVERAGE CLOSING PRICE AT THIRD ANNIVERSARY. The average
                  closing price of OCA common stock during the 10 trading days
                  immediately preceding the third anniversary of the Merger,

         IF, during the 12 calendar months immediately preceding the third
         anniversary of the Merger:

                  70% INCREASE IN SERVICE FEES IN YEAR 3. The amount of (A)
                  service or consulting fees (excluding any center or other
                  expense reimbursement) paid to OCA or its subsidiary by the
                  OrthAlliance Affiliated Practitioner or his or her
                  professional entity under the OCA Business Services Agreement,
                  is at least 70% greater than (B) service or consulting fees
                  (excluding any center or other expense reimbursement) that
                  would have been payable to OCA or its subsidiary by the
                  OrthAlliance Affiliated Practitioner or his or her
                  professional entity under the OCA Business Services Agreement
                  during the 12 calendar months immediately preceding the Merger
                  (assuming that the OCA Business Services Agreement had been in
                  effect during that period and also assuming that the operating
                  margin of the practice during that period was 5% higher than
                  the actual operating margin for that period).

         PRO RATA AMOUNT. However, if this 70% target increase in service or
         consulting fees is not achieved during the 12 calendar months
         immediately preceding the third anniversary of the Merger, but the
         amount of service or consulting fees paid during that period is at
         least equal to the amount that would have been paid under the OCA
         Business Services Agreement during the 12 calendar months immediately
         preceding




                                       6
   25

         the Merger (based on the assumptions described above), then OCA may
         grant the OrthAlliance Affiliated Practitioner a pro rata amount of the
         shares of OCA common stock that OCA may have granted if the target
         amount had been achieved. For example, if the amount of service or
         consulting fees increased 35% (i.e., one-half of the targeted increase)
         during that period, then the OrthAlliance Affiliated Practitioner may
         be granted one-half of the number of shares issuable if the target had
         been achieved.

         AMENDMENTS. For OrthAlliance Affiliated Practitioners who, along with
their respective professional entities, amend their respective employment
agreement and OrthAlliance Service or Consulting Agreement prior to the Merger
as contemplated by Sections 2.4 and 7.2(e) of the Merger Agreement, OCA may
issue them a number of shares of OCA common stock equal to:

         (a)      3,

                  TIMES

         (b)      70% OF SERVICE FEES IN PRIOR 12 MONTHS. 70% of the amount of
                  service, consulting or management fees (excluding any center
                  or other expense reimbursement) paid by the OrthAlliance
                  Affiliated Practitioner or his or her professional entity to
                  OrthAlliance or its subsidiaries during the 12 calendar months
                  prior to the Merger,

                  DIVIDED BY

         (c)      AVERAGE CLOSING PRICE AT THIRD ANNIVERSARY. The average
                  closing price of OCA common stock during the 10 trading days
                  immediately preceding the third anniversary of the Merger,

         IF, during the 12 calendar months immediately preceding the third
         anniversary of the Merger:

                  70% INCREASE IN SERVICE FEES IN YEAR 3. The amount of (A)
                  service or consulting fees (excluding any center or other
                  expense reimbursement) paid to OCA or its subsidiary by the
                  OrthAlliance Affiliated Practitioner or his or her
                  professional entity under their OrthAlliance Service or
                  Consulting Agreement is at least 70% greater than (B) service
                  or consulting fees (excluding any center or other expense
                  reimbursement) paid to OrthAlliance or its subsidiary by the
                  OrthAlliance Affiliated Practitioner or his or her
                  professional entity under their OrthAlliance Service or
                  Consulting Agreement during the 12 calendar months immediately
                  preceding the Merger.

         PRO RATA AMOUNT. However, if this 70% target amount of increased
         service or consulting fees is not achieved during the 12 calendar
         months immediately preceding the third anniversary of the Merger, but
         the amount of service or consulting fees paid during that period is at
         least equal to the amount paid during the 12 calendar months
         immediately preceding the Merger, then OCA may grant the OrthAlliance
         Affiliated Practitioner a pro rata amount of the shares of OCA common
         stock that OCA may have granted if the target amount had been achieved.
         For example, if the amount of service or consulting fees increased 35%
         (i.e., one-half of the targeted increase) during that period, then the
         OrthAlliance Affiliated Practitioner may be granted one-half of the
         number of shares issuable if the target had been achieved.



                                       7
   26


         OCA MAY CHOOSE TO SUBSTITUTE INTEREST BEARING NOTE. OCA could elect, in
its sole discretion, to issue the OrthAlliance Affiliated Practitioner a
promissory note in an amount equal to that computed as described above, which
would be payable over 7 years and bear interest at the prime rate plus 1.5% per
year, in lieu of shares of OCA common stock.

         DATES OF GRANTS; CONDITION TO VESTING. Shares granted under this
program would be issuable in four annual installments, with one-fourth of the
shares to be issued following each of the fifth, sixth, seventh and eighth
anniversaries of the Merger if, during the 12 calendar months prior to that
anniversary, the amount of service or consulting fees paid by the OrthAlliance
Affiliated Practitioner and his or her professional entity to OCA or its
subsidiary is at least 90% of the amount of service or consulting fees they paid
to OrthAlliance or its subsidiary during the 12 calendar months prior to the
Merger.

         PRACTICES WITH MULTI-OWNERS. If an OrthAlliance Affiliated
Practitioner's professional entity is partially owned by one or more other
OrthAlliance Affiliated Practitioners, these amounts would be computed on a pro
rata basis. In addition, the co-owner OrthAlliance Affiliated Practitioners
would have to execute and deliver the applicable amendments to their employment
agreement and OrthAlliance Service or Consulting Agreement, or new OCA Business
Services Agreement, as applicable, prior to the Merger.

         ELIGIBILITY TO PARTICIPATE. To be eligible to participate in this
program, an OrthAlliance Affiliated Practitioner, along with his or her
professional entity, prior to the Merger would have to either (1) amend their
existing employment agreement and OrthAlliance Service or Consulting Agreement,
as contemplated by Sections 2.4 and 7.2(e) of the Merger Agreement, or (2) enter
into an OCA Business Services Agreement in replacement of their existing
OrthAlliance Service or Consulting Agreement (effective as of the Merger).
Participation would also require the execution of a written participation
agreement between OCA and the OrthAlliance Affiliated Practitioner that sets
forth, or incorporates by reference, the terms of the program. Participation in
and the grant of any shares under this program would also be conditioned upon,
and subject to, completion of the Merger.

         In addition, to be eligible to participate in this program, an
OrthAlliance Affiliated Practitioner, along with his or her professional entity,
may not be a party to any pending or threatened litigation against OrthAlliance,
OCA or their subsidiaries, nor have given notice of termination or intention to
terminate their respective OrthAlliance Service or Consulting Agreement, and
must be in compliance with their obligation to pay service or consulting fees
under their OrthAlliance Service or Consulting Agreement. If such litigation or
notice has been commenced, threatened or given, it would need to have been
dismissed with prejudice or fully withdrawn in a manner acceptable to OCA.

         DUE DILIGENCE TO DETERMINE OPERATING MARGIN. To permit OCA to determine
the appropriate operating margin for computing the number of shares to be
granted under this program with respect to a new OCA Business Services
Agreement, the OrthAlliance Affiliated Practitioner would provide OCA with
financial information OCA reasonably requests about his or her practice.



                                       8
   27



ADDITIONAL INCENTIVES FOR ENTERING INTO NEW OCA AGREEMENT

         In addition to the two programs described above, OCA may offer
additional shares of its common stock to OrthAlliance Affiliated Practitioners
as an incentive for these individuals and their professional entities to enter
into an OCA Business Services Agreement prior to the Merger, in replacement of
their existing OrthAlliance Service or Consulting Agreement effective as of the
Merger. These shares may be issued to eligible OrthAlliance Affiliated
Practitioners generally on the following terms under OCA's:

         o        Conversion Incentive Program; and

         o        Doctors Trust Program.


1.       CONVERSION INCENTIVE PROGRAM

         Under OCA's Conversion Incentive Program, OCA may grant shares of its
common stock to eligible OrthAlliance Affiliated Practitioners who, along with
their professional entity, enter into an OCA Business Services Agreement (which
would be effective upon the Merger) on or before July 27, 2001, in an amount
equal to:

         (a)      4,

                  TIMES

         (b)      The amount by which:

                  (i)      FEES UNDER OCA AGREEMENT. Service or consulting fees
                           (excluding any center or other expense reimbursement)
                           that would have been payable to OCA or its subsidiary
                           by the OrthAlliance Affiliated Practitioner or his or
                           her professional entity under the OCA Business
                           Services Agreement during the 12 calendar months
                           immediately preceding the Merger (assuming that the
                           OCA Business Services Agreement had been in effect
                           during that period and also assuming that the
                           operating margin of the practice during that period
                           was 5% higher than the actual operating margin for
                           that period),

                           EXCEEDS

                  (ii)     FEES UNDER EXISTING AGREEMENT. Service, consulting or
                           management fees (excluding any center or other
                           expense reimbursement) paid to OrthAlliance or its
                           subsidiaries by the OrthAlliance Affiliated
                           Practitioner or his or her professional entity during
                           the 12 calendar months immediately preceding the
                           Merger under their existing OrthAlliance Service or
                           Consulting Agreement,

                           DIVIDED BY

         (c)      AVERAGE CLOSING PRICE AT MERGER. The average closing price of
                  OCA common stock during the 10 trading days prior to the
                  Merger.


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         DATES OF GRANTS; CONDITION TO VESTING. Shares granted under this
program would be issuable in four annual installments, with one-fourth of the
shares to be issued following each of the second, third, fourth and fifth
anniversaries of the Merger if, during the 12 calendar months prior to that
anniversary, the amount of service or consulting fees paid by the OrthAlliance
Affiliated Practitioner and his or her professional entity to OCA or its
subsidiary is at least 90% of the amount of service or consulting fees they paid
to OrthAlliance or its subsidiary during the 12 calendar months prior to the
Merger.

         ELIGIBILITY TO PARTICIPATE. To be eligible to participate in this
program, an OrthAlliance Affiliated Practitioner, along with his or her
professional entity, would have to, on or before July 27, 2001 enter into an OCA
Business Services Agreement in replacement of their existing OrthAlliance
Service or Consulting Agreement (effective as of the Merger). Participation
would also require the execution of a written participation agreement between
OCA and the OrthAlliance Affiliated Practitioner that sets forth, or
incorporates by reference, the terms of the program. Participation in and the
grant of any shares under this program would also be conditioned upon, and
subject to, completion of the Merger.

         In addition, to be eligible to participate in this program, an
OrthAlliance Affiliated Practitioner, along with his or her professional entity,
may not be a party to any pending or threatened litigation against OrthAlliance,
OCA or their subsidiaries, nor have given notice of termination or intention to
terminate their respective OrthAlliance Service or Consulting Agreement, and
must be in compliance with their obligation to pay service or consulting fees
under their OrthAlliance Service or Consulting Agreement. If such litigation or
notice has been commenced, threatened or given, it would need to have been
dismissed with prejudice or fully withdrawn in a manner acceptable to OCA.

         DUE DILIGENCE TO DETERMINE OPERATING MARGIN. To permit OCA to determine
the appropriate operating margin for computing the number of shares to be
granted under this program, the OrthAlliance Affiliated Practitioner would
provide OCA with financial information OCA reasonably requests about the
practice.

         PRACTICES WITH MULTI-OWNERS. If an OrthAlliance Affiliated
Practitioner's professional entity is partially owned by one or more other
OrthAlliance Affiliated Practitioners, these amounts would be computed on a pro
rata basis. In addition, the co-owner OrthAlliance Affiliated Practitioners
would have to execute and deliver the new OCA Business Services Agreement by
July 27, 2001.




                                       10
   29




2.       DOCTORS TRUST PROGRAM

         Under OCA's Doctors Trust Program, for eligible OrthAlliance Affiliated
         Practitioners:

         TWO YEAR OPTION TO PURCHASE SHARES. At anytime during the two years
immediately following the Merger, the OrthAlliance Affiliated Practitioner could
elect, by giving OCA written notice, to purchase a number of shares of OCA
common stock equal to (A) $60,000, divided by (B) the average closing sales
price per share of OCA common stock reported for the 10 trading days immediately
prior to the Merger.

         INSTALLMENT PAYMENTS OF PURCHASE PRICE. The purchase price of the
shares would equal $40,000 and would be payable by the OrthAlliance Affiliated
Practitioner in 40 equal quarterly installments of $1,000 each over a period of
10 years, beginning on the second anniversary of the Merger.

         RESTRICTIONS ON TRANSFER. These shares would be subject to contractual
restrictions on transfer. No shares could be sold or transferred prior to the
eleventh anniversary of the Merger. Beginning on that eleventh anniversary,
one-seventh of the shares would become eligible for sale or transfer during each
of the following seven years.

         FORFEITURE OF SHARES. Shares that are not then granted or eligible for
sale or transfer would be forfeited if the OrthAlliance Affiliated Practitioner:

         (a)      Ceases to be employed full-time as an orthodontist or
                  pediatric dentist, as applicable, in his or her respective
                  practice prior to the tenth anniversary of the Merger, or

         (b)      Ceases to own an equity interest in the professional entity
                  that is a party to the OCA Business Services Agreement prior
                  to the tenth anniversary of the Merger, or

         (c)      And his or her professional entity's OCA Business Services
                  Agreement terminates, or

         (d)      Or his or her professional entity fails to utilize OCA's
                  proprietary computer software and business systems in
                  connection with the business functions of their practice, or

         (e)      Or his or her professional entity fails to comply with OCA's
                  policies, procedures and systems, including a productive
                  working relationship with OCA's corporate office staff and
                  other orthodontists and dental professionals who are
                  affiliated with OCA, fulfil his or her financial obligations
                  to OCA or its subsidiaries, or breaches his or her OCA
                  Business Services Agreement.

         NO RETURN OF PURCHASE PRICE. If shares acquired under this program are
forfeited, any purchase price previously paid would not be returned, but further
obligations to pay the quarterly installments would be canceled.

         DEATH OR DISABILITY. If the OrthAlliance Affiliated Practitioner dies
or becomes permanently disabled (and ceases to practice orthodontics or
pediatric dentistry, as applicable), a proportionate number of shares for which
quarterly installments of purchase price had then been paid (that is,
one-fortieth of the number of shares for each quarterly installment of purchase
price that had been paid) would not be forfeited due to those events, and
one-seventh of that proportionate amount would become eligible for sale or
transfer during each of the following seven years.


                                       11
   30

         TRANSFER OF PRACTICE AFTER 10 YEARS. If the OrthAlliance Affiliated
Practitioner remains employed full-time as an orthodontist or pediatric dentist,
as applicable, in his or her respective practice, owns an equity interest in the
professional entity that is a party to the OCA Business Services Agreement,
remains a party to an OCA Business Services Agreement and otherwise complies
with the terms and conditions of this program through the tenth anniversary of
the Merger, then the OrthAlliance Affiliated Practitioner could thereafter
transfer his practice to another orthodontist or pediatric dentist, as
applicable, acceptable to OCA who assumes all of the OrthAlliance Affiliated
Practitioner's obligations under the OCA Business Services Agreement and,
subject to continued compliance with his or her covenant not to compete, a
proportionate number of shares for which quarterly installments of purchase
price had then been paid would not be forfeited due to those events, and
one-seventh of that proportionate amount would become eligible for sale or
transfer during each of the following seven years.

         ELIGIBILITY TO PARTICIPATE. To be eligible to participate in this
program, an OrthAlliance Affiliated Practitioner, along with his or her
professional entity, would have to, prior to the Merger, enter into an OCA
Business Services Agreement in replacement of their existing OrthAlliance
Service or Consulting Agreement (effective as of the Merger). Participation
would also require the execution of a written participation agreement between
OCA and the OrthAlliance Affiliated Practitioner that sets forth, or
incorporates by reference, the terms of the program. Participation in and
purchase of shares under this program would also be conditioned upon, and
subject to, completion of the Merger.

         In addition, to be eligible to participate in this program, an
OrthAlliance Affiliated Practitioner, along with his or her professional entity,
may not be a party to any pending or threatened litigation against or involving
OrthAlliance, OCA or their subsidiaries, nor have given notice of termination or
intention to terminate their respective OrthAlliance Service or Consulting
Agreement, and must be in compliance with their obligation to pay service or
consulting fees under their OrthAlliance Service or Consulting Agreement. If
such litigation or notice has been commenced, threatened or given, it would need
to have been dismissed with prejudice or fully withdrawn in a manner acceptable
to OCA.

         PRACTICES WITH MULTI-OWNERS. If an OrthAlliance Affiliated
Practitioner's professional entity is partially owned by one or more other
OrthAlliance Affiliated Practitioners, the co-owner OrthAlliance Affiliated
Practitioners would have to execute and deliver the new OCA Business Services
Agreement prior to the Merger.


                                       12
   31
                              QUESTIONS AND ANSWERS

Q1. If I sign the amendments to the OrthAlliance form of employment agreement
and service agreement, does my service fee calculation change?

A. No. If you are staying on the OrthAlliance form of Service Agreement,
Consulting and Business Services Agreement or Management Service Agreement, your
service fee calculation is not being changed. Of course, if you sign the OCA
form of business services agreement, then a different service fee calculation
would apply.

Q2. I am thinking about switching to the OCA contract, but I do not want to miss
the opportunity to receive the incentives for making an early commitment. Can I
sign the amendments to my OrthAlliance agreements and then take more time to
decide on switching to the OCA contract?

A. Yes. You can sign the OrthAlliance amendments now and then take until July
27, 2001 to sign the OCA contract. You would still be eligible to receive the
designated incentives for signing the OCA contract.

Q3. What do I have to pay for in order to use the OCA computer systems?

A. The cost of the software would be included in your service fee. You would
need to pay for the hardware. If you do not have the necessary hardware, OCA
would help you locate the right equipment and may assist you in financing the
purchase of that equipment.

Q4. How will my OrthAlliance-provided general liability and property insurance
coverage be affected by the merger?

A. At the time of the merger, you will not have to change your coverage. We have
learned that OCA also uses Marsh as its insurance broker, which is the same
insurance broker that OrthAlliance uses. This will help to make the transition a
smooth one. Generally, we believe that OCA will offer general liability and
property insurance coverage that is equivalent to or better than your current
policies.

Q5. If I employ television advertising, after obtaining OCA's consent if
required, how will my practice be charged for such advertising?

A. Advertising charges are based on the costs associated with advertising in a
particular television advertising market, and each of the practices using the
advertising in such a market pays a portion of the advertising costs. The total
costs are allocated to the participating practices based on new case starts.
Although OCA has considered other cost allocation methods, the company has found
that using new case starts is the most equitable method of allocation.


   32


Q6. If I want to build a new satellite office, who will bear the expenses of the
satellite development?

A. Under the OrthAlliance form of contract, OrthAlliance has loaned funds for
approved satellite expansions or paid for the expansion and charged the
depreciation expense to the practice over a five-year term. If you choose to
sign the OCA form of contract, OCA generally bears 40% of the expense and the
doctor bears 60% of the expense for approved satellite expansions. In addition,
OCA may loan the doctor his portion of the expense.

Q7. If I choose not to amend my OrthAlliance form of employment agreement, will
I still be able to use OCA's business systems, such as the computer systems and,
if so, how will I be charged for these services?

A. Yes, all of OCA's business systems are available even if you continue with
your existing OrthAlliance form of contracts, without amending them. These
systems are provided at no additional charge beyond the service fees provided
for in your existing agreement with OrthAlliance.

Q8. If I agree to use the OCA systems, do I have to use all of the OCA systems
or can I only use the ones that I feel like using?

A. If you agree to use the OCA systems, you must use all of the OCA systems.



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IN CONNECTION WITH THE PROPOSED MERGER, OCA WILL FILE A REGISTRATION STATEMENT
ON FORM S-4 WITH THE SECURITIES AND EXCHANGE COMMISSION ("SEC"). INVESTORS ARE
URGED TO READ THE PROXY STATEMENT/PROSPECTUS THAT WILL BE PART OF THE
REGISTRATION STATEMENT, BECAUSE IT WILL CONTAIN IMPORTANT INFORMATION ABOUT THE
MERGER, OCA AND ORTHALLIANCE. AFTER THE REGISTRATION STATEMENT IS FILED WITH THE
SEC, THE REGISTRATION STATEMENT AND THE PROXY STATEMENT/PROSPECTUS WILL BE
AVAILABLE FREE OF CHARGE, BOTH ON THE SEC'S WEB SITE (www.sec.gov) AND FROM OCA
AND ORTHALLIANCE BY DIRECTING A REQUEST TO ORTHODONTIC CENTERS OF AMERICA, INC.,
5000 SAWGRASS VILLAGE CIRCLE, SUITE 30, PONTE VEDRA BEACH, FL 32082, ATTENTION:
INVESTOR RELATIONS, OR TO ORTHALLIANCE, INC., 21535 HAWTHORNE BOULEVARD, SUITE
200, TORRANCE, CA 90503, ATTENTION: INVESTOR RELATIONS. ORTHALLIANCE AND ITS
DIRECTORS AND OFFICERS MAY BE DEEMED TO BE PARTICIPANTS IN THE SOLICITATION OF
PROXIES WITH RESPECT TO A SHAREHOLDER MEETING TO BE HELD IN CONNECTION WITH SUCH
MERGER. INFORMATION ABOUT THE PARTICIPANTS IN THE SOLICITATION, INCLUDING THEIR
INTERESTS IN SHARES OF ORTHALLIANCE'S COMMON STOCK, IS SET FORTH IN
ORTHALLIANCE'S ANNUAL REPORT ON FORM 10-K FOR THE YEAR ENDED DECEMBER 31, 2000
FILED WITH THE SEC. INVESTORS MAY OBTAIN ADDITIONAL INFORMATION REGARDING THE
INTERESTS OF ORTHALLIANCE AND ITS DIRECTORS AND OFFICERS BY READING THE PROXY
STATEMENT/PROSPECTUS WHEN IT BECOMES AVAILABLE.

THIS DOES NOT CONSTITUTE AN OFFER OF ANY SECURITIES FOR SALE, NOR THE
SOLICITATION OF AN OFFER TO BUY ANY SECURITIES. ANY INDICATION OF INTEREST IN
RESPONSE TO THIS COMMUNICATION WILL INVOLVE NO OBLIGATION OR COMMITMENT. NO
SECURITIES WILL BE SOLD OR GRANTED IN ANY JURISDICTION IN WHICH THE OFFER,
SOLICITATION OR SALE OF SUCH SECURITIES WOULD BE UNLAWFUL PRIOR TO REGISTRATION
OR QUALIFICATION UNDER THE SECURITIES LAWS OF SUCH JURISDICTION.