Have you ever been interested in training to become a dentist, or further train an additional three-years to become an orthodontist? 
No I haven't, honestly the thought of putting my hands in other people's mouths for a living grosses me out. If I did though I would definitely want to become an orthodontist.
Have you ever wanted to live in another country?  There are a number of dental school in various countries around the world. I bet some areas of the world really need dentists.