I've applied to both. Dental is 1000x harder than Optometry to get into a program. OAT is harder because of the physics section requires more study time than the DAT's PAT section, but a 300 OAT score can get you accepted somewhere. For the DAT you'll want a 21. A 21 DAT vs a 300 OAT are very different. 300 OAT is like 50% while the 21 DAT is 91%. The average OAT score for acceptance is 320-330 depending on school, and that still like a 75%. Dental schools average 21 for DAT but that isn't the same for every school. Mississippi dental average DAT is like 18-19 but they only take in state applicants. All other sections on the OAT and DAT are the same. The other biggest factor is there are more people applying to dental than opt. My state has both and the dental gets about 1800 applicants a year while the Opt gets 400 and the class size for the programs are about the same. GPA requirements for dental are also much higher. I'd guess 3.7-3.8 is the average dental GPA while Opt is like a 3.3-3.4.