A degree in biology will give you the edge in dental school...but of course this is just what I've heard. I start dental school in the fall, so I don't know this for sure.
But it makes sense to me either way, since first year is full of the biological sciences. BUT, I do not think that schools prefer a science background. They prefer that you major in something that you're interested in, and feel confident about. That being said, I personally feel that being a science major would imply that you enjoy science, which is a must for dental school.
So in the end, it just depends on the applicant pool and your other qualifications. For example, if you were a science major, but had no dental/health care related experience compared to a person without a science background but with dental experience, they might get chosen over you if all else was equal.
The whole admissions process is mind game in my opinion..so it's tough to really know what's going on. So my advice to you is to go with your gut, and study what you love the most.
Good Luck!!
Hot-n-Aml.
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UPitt, SDM, Class of 2007