Look, it doesn't matter what you major in. If you're shooting for dental school, you could be an art history major with a minor in armpit farting and, as long as you have the pre-reqs and the grades and the DAT scores and the ECs and the interview, you'll get into whatever d-school you want. I was a philosophy and religion major and every adcom I've talked to has said that I'll add a refreshing dimension to the class when I get in because EVERYONE is a bio major!
And if you change your mind about the teeth thing or don't get in, again, the real world doesn't care what you majored in as long as you have the grades. I know physics majors who went to law school and econ majors who are doing non-profit film work. I also know a bio major who got poor grades and had to take the only job he could find -- as a shoe salesman in the mall. Do well. It doesn't matter in what.
Mack