As mentioned above, it doesn't matter where you go. But make sure you go to dental school to be a dentist. A very small fraction of people go on to become OMFS with an MD.
If you don't mind me asking, if you're positive you want to go to a 6 years OMS program, why don't you go to a school that has a historically higher rate of specializing? Again, not saying that you can't from ATSU and MOSDOH; but they are pretty expensive from my understanding, so it's not price.