Last updated: October 10, 2026

If you are a prospective dental or optometry student, you may be preparing for the Dental Admission Test (DAT) or Optometry Admission Test (OAT). These examinations are used in admissions to dental and optometry education programs, respectively. Each program determines how it evaluates examination results. In this guide, we compare the content, scoring, timing, and retesting rules for the DAT and OAT to help you plan your preparation.

Which Is Harder — the DAT or the OAT?

The DAT and OAT have different content requirements. The DAT includes a Perceptual Ability Test (PAT), which assesses object dimensions and the ability to mentally manipulate objects in space. The OAT includes a separate Physics section and no PAT. Rather than treating one exam as automatically easier, compare the official content specifications with your preparation needs and the requirements of the programs you plan to apply to.

👉 What Is the DAT Exam? Full Guide to Structure, Scoring and Prep

👉 DAT Percentiles Guide — How to Interpret Your Score

DAT vs OAT: Key Differences at a Glance

Content and Format

The DAT consists of four timed sections: Survey of the Natural Sciences (100 questions: Biology 40, General Chemistry 30, Organic Chemistry 30), Perceptual Ability Test (90 questions), Reading Comprehension (50 questions), and Quantitative Reasoning (40 questions). The four sections contain 280 questions in total.

The OAT consists of four timed sections: Survey of the Natural Sciences (100 questions: Biology 40, General Chemistry 30, Organic Chemistry 30), Reading Comprehension (50 questions), Physics (40 questions), and Quantitative Reasoning (40 questions). Physics is a separate section, not part of the Survey of the Natural Sciences. The four sections contain 230 questions in total.

While both exams cover biology, chemistry, and math, only the OAT includes a dedicated Physics section, and only the DAT includes the Perceptual Ability Test (PAT).

Timing

The DAT timed sections total 4 hours and 15 minutes: Survey of the Natural Sciences 90 minutes, PAT 60 minutes, Reading Comprehension 60 minutes, and Quantitative Reasoning 45 minutes. The full administration schedule is 5 hours and 15 minutes, including a 15-minute optional tutorial, a 30-minute optional scheduled break, and a 15-minute optional post-test survey.

The OAT timed sections total 4 hours and 5 minutes: Survey of the Natural Sciences 90 minutes, Reading Comprehension 60 minutes, Physics 50 minutes, and Quantitative Reasoning 45 minutes. The full administration schedule is 5 hours and 5 minutes, including a 15-minute optional tutorial, a 30-minute optional scheduled break, and a 15-minute optional post-test survey.

For both exams, the scheduled optional break follows the first two sections. Tutorial, break, and survey time are not additional time for answering test questions. Report to the test center at least 30 minutes before your scheduled appointment.

Scoring

The DAT reports scaled scores from 200 to 600, and the OAT reports scaled scores from 200 to 400. Both use 10-point increments. The DAT three-digit reporting scale took effect on March 1, 2025; that change does not apply to OAT scores.

Neither examination has an official passing score. Each educational program determines what scores it considers acceptable. A scale midpoint is not proof of a current national average, and neither guide establishes universal competitive or excellent score bands.

Results are reported as scale scores, not raw totals or percentile ranks. Both testing programs use psychometric equating procedures to account for differences among test forms. For percentile context, consult the most recent official examination norms for the correct exam and score type rather than treating the same number as equivalent across the DAT and OAT.

Retesting Rules for the DAT and OAT

Both guides require a new application and examination fee for each testing attempt. Candidates must wait at least 60 days between attempts, with a maximum of four administrations of the same examination in any 12-month period. These limits apply separately to each examination, not as a combined DAT-and-OAT allowance.

After three or more attempts on the relevant examination, candidates must apply for permission to test again and provide proof of a recent application to dental school for the DAT or optometry school for the OAT with each subsequent application to test. After the fifth attempt on the relevant examination, a candidate may retest only once per 12-month period. If four attempts have been completed within a 12-month period, a fifth cannot occur until 12 months have passed from the first of those four attempts.

Retaking a completed examination is different from rescheduling an appointment. Check the current guide for the examination you are taking before applying for a retest.

Purpose

Although both exams are used for admissions, they emphasize different skills:

DAT: Includes PAT alongside the natural sciences, reading comprehension, and quantitative reasoning.
OAT: Includes a separate Physics section, whose listed topics include optics, alongside the natural sciences, reading comprehension, and quantitative reasoning.

Preparation Tips

To prepare effectively for the DAT vs OAT:

• Review all tested content areas thoroughly
• Review the current official DAT or OAT Candidate Guide, content specifications, tutorial, and available practice questions for the examination you will take
• Take short, timed practice sets to build endurance
• Focus on mastery, not memorization

Official practice-resource references:

ADA DAT Resources:
Official DAT Practice Test Information — ADA

OAT Practice Resources:
The OAT Candidate Guide directs candidates to oat.ada.org for official practice questions. Practice questions help candidates understand question types; they are not intended to predict performance on the OAT.

Ready to Start Preparing?

The DAT Destroyer and OAT Destroyer by Dr. Jim Romano have helped thousands of students master the sciences and gain confidence before test day.

Explore our full study collection here:
orgoman.com

Frequently Asked Questions: DAT vs OAT

Is the DAT harder than the OAT?

The content differs: the DAT includes PAT, while the OAT includes a separate Physics section. Use the official specifications to identify your preparation needs rather than relying on a universal harder-or-easier label.

Can I use DAT materials to study for the OAT?

Yes. The science overlap is significant. Many OAT students use DAT Destroyer, Dynamite Biology Review, Organic Chemistry Odyssey, and General Chemistry Destroyer with great success.

Both examinations include Biology, General Chemistry, and Organic Chemistry, but shared subjects do not make their complete content identical. OAT preparation must also address its separate Physics section. Check the official specifications for all four sections of the examination you will take, including Reading Comprehension and Quantitative Reasoning.

What is considered a good DAT or OAT score?

The current DAT scale is 200–600, while the OAT scale is 200–400. Neither examination has an official passing score or a universal competitive cutoff. Review each target school's current requirements and dated class profiles, and use the applicable official examination norms to interpret your scaled scores.

What should I do after the exam?

If you are exploring career paths after dental school, read our guide:
Should I Specialize After Dental School?

Get the Right Tools for a Higher DAT or OAT Score

👉 DAT and OAT Classes (In-Person and Online)
orgoman.com/pages/dat-classes

👉 DAT Destroyer, Math Destroyer, Organic Chemistry Odyssey, General Chemistry Destroyer
orgoman.com/products/dat-destroyer

👉 DAT and OAT Destroyer Study Group — download Dr. Romano's Biology Review free
DAT and OAT Destroyer Study Group on Facebook

As Dr. Romano says: “Get the damn book — it is all in there.”