The DAT:
DAT explained and what to do if you scored poorly.
The Dental Admissions Test is one of the crucial components of your application and is one of the key factors that dental schools use in comparing you to other applicants. It is an approximately four-hour long, computer administered, multiple choice, standardized exam that you will take. There is a fee for taking the exam and distributing your scores to schools.
The DAT is scored on a scale from 1 to 30. Generally speaking, a score of 20 or above on any one section places you in about the 90% percentile for that section of the exam. The average score for most admitted dental school applicants is around 19, depending upon the school. You can get in with lower DAT scores, but you should aim to score above these marks to be considered a competitive applicant by admissions committees.
There are four sections to the DAT: Natural Sciences, which includes Biology, Chemistry and Organic Chemistry, Perceptual Ability, Reading Comprehension, and Quantitative Reasoning. There are also sections that dental schools feel are more important than others. For instance, the QRT (Quantitative Reasoning Test) is considered by many schools to be the least important section of the DAT (for instance, I scored below average in this section and still got in!). And sections such as the Natural Sciences and the Perceptual ability are of critical importance.
If you score below an average of 17, you should retake the DAT after more preparation. The number of books, computer products and the Kapplan course are all excellent options for improving your overall score.

We hope that this was helpful and informative. We interviewed a group of highly successful undergraduate students who were just accepted into Dental School. They share all the inside tips and strategies they used to gain acceptance to the school of their choice. Watch these videos for a firsthand account of their experiences and insight on what it takes to get into dental school. They are all from a average sized university but received offers of admission from across the country from multiple dental schools. Don’t let the size of your undergraduate college or program discourage you from applying to any dental school. Do the work, set yourself apart from the crowd and you can get in!
this is from the ADA page explaining retesting:
Retesting
Examinees are required to submit a new application and fee for each retest. An examinee must wait at least 90 days to retake the DAT. You may submit a new application to retest and upon receipt of notification of eligibility for retesting, you may visit www.Prometric.com or call the Prometric Contact Center at 800.688.5804 to schedule a retest appointment at least 90 days from your last attempt.