I have definitely considered orthodontics -- although, my parade was sort of rained on when I found out how difficult it is to score an ortho residency (you must be in the top 1% of the class, etc.). I've thought about periodontics, too, but the work sounds kind of icky (a lot nastier than what an orthodontist or general dentist would see).
So, for now, one of my goals is to just get accepted to either a dental or AA school.