I think you are talking about a Dental School. Many dental schools will do all kinds of dental services at a much lower price then general dentist. The teachers are there to oversee. Keep in mind the prices are lower because it is a school. If you have Insurance and want to go to a dental school make sure they will cover you to do so.
I do not know what school you are looking for in your area but here is a link for you to see what is available to you.
I hope I have helped