Go to school whereever.. then take the regional board exam for the state that you want to practice in. Once you pass, apply for a license in that state. Where you go to school has nothing to do with where you practice. If i went to dental school in Cali, and I wanted to practice in NJ, I would take the NERBs (Northeast regional board exam) and then apply for a license in NJ.
edit... going to school in the region you want to practice will make your life easier though when you take the regional board exam... Usually, your school will host the exam for that region, so you can take it in your own chair with your own patients. If you go to school in Cali and take the NERB in NJ, then you have to find patients in NJ or find one in cali and fly them out to NJ. Its a real pain in the ass, but people do it.