I wasn't a dentist, but I did serve in the Air Force Reserve and spent a lot of time with the Dental Officers in my medical unit. During the weekend drills every month, they really didn't get to do much dentistry at all. They basically did annual exams to make sure you didn't have any dental issues that would prevent you from being ready to deploy. Anytime they found anything (caries, periapical lesion, failed restoration, etc...), they would note it in your chart, and tell you to go to a civilian dentist to have the work done so you could be dentally qualified to deploy. They weren't allowed to do any procedures, and all the work that needed to be done was sent out to civilian dentists. The only time they got to actually practice dentistry and spin a drill was on their two week annual tour. I can't say for sure that it is like that at every unit, but I've heard that if you actually want to do dentistry part-time in the military, you should look into the Army/Air National Guard.