I'm majoring in Anthropology with a minor in Spanish. So by all means, you DON'T need to major in Bio. You still need to take a bunch of science classes, but I honestly think that you will get plenty of science in dental school that you do not need to major in Biology unless you really want to. Based on your post, however, it doesn't seem like you really have a passion for biology, which will make your undergrad experience not as fun if you decide to major in it. Anyway, just a tip. Your undergraduate experience is a once in a lifetime experience to do whatever you want! Enjoy it!