I'm a Navy dentist finishing my last year of a 4 year commitment. There are alot of variables that play into this decision.
First is finances. Do you or will you have a lot of student debt when you graduate? If a 3 year military commitment, prevents you from borrowing another 60-80 grand, that could be reason enough. IF you don't owe much, it may not be the best decision financially.
Finances aren't everything though. Do you have other plans coming out of dental school? Many new grads just flounder in associateships that really don't challenge them clinically or are dead end positions not leading to any sort of practice equity, etc. Or do you have something lined up with a dentist who will be a good mentor and/or may look to transition the practice in the future. The money may be good, but most of usually goes to paying back loan debt in your early years of practice. You may have less of this with time in the service.
Clinical experience in the military with young dentists varies widely. Really depends on where you get stationed, who you wind up working for, working with, and how long you are there. I have had friends who've had great experience (myself included) learned a ton that. The service offers AEGDs and GPRs to new grads too. Don't know if there's an additional commitment with this, though. I didn't do either, but learned a ton (in many ways more than those in residency) at the clinics I have been stationed at. I have other friends who don't think so highly of their experience. Some of it's luck, some of it is your own doing. Email me on this if you want more info.
Another consideration is where you'll be living. Life experience sorta stuff. You could be in another country (traveling the world) working for just a few years. Or you could be in the middle of Bumble Butt, USA bored out of your mind. Even though you are considering the Air Force, there is still that possibility you could deploy (Middle East). Unlikely, but still could happen. If you have a family, this may not be the best decision. This can be a life changing experience (so I've heard). I know some who would never want to do it again, others waiting to go for their next deployment. Again, with the Air Force this would be unlikely. It all depends on how well you can negotiate where you want to go. I was supposed to be stationed in Hawaii for my last 3 years, but wound up in San Diego, CA instead. Wouldn't have been bad either place. It worked out tremendously well for me, but I got very very lucky.
These are just some considerations. I don't regret my decision to join the Navy at all. I know others that wish they never did. Don't get me wrong, though, there's a lot of stuff that isn't perfect in military dentistry. I'm glad I did my time, glad I'm getting out. Please contact me if you are seriously considering this.