This was taken directly from the ADA's DAT Guide on their website:
Additional Eligibility Requirement
Examinees who have attended three or more tests must apply for permission to retest. For test administration purposes, an examinee is considered as having attended a test each time the examinee is seated at a computer workstation at a Prometric Test Center and starts the test by electronically agreeing to the confidentiality statement.
Requests for additional testing must be submitted in writing to the Department of Testing Services (DTS) and must include evidence of current (within the previous 18 months) intent to apply to dental school. Acceptable forms of evidence include (you need submit only one of the following):
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-A copy of a completed and submitted AADSAS application.
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-A letter of rejection from a dental school.
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-A letter on school stationery/letterhead from a dental school admissions officer encouraging you to retest or reapply.
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-A letter on school stationery/letterhead from a college/university health profession advisor/instructor verifying that you are applying to dental school.
Upon approval, you will be permitted to retake the DAT once per twelve-month period.
The results of the four most recent DATs taken, as well as the total number of DATs taken, are released on the official scores and forwarded to dental schools.
