Well, these are not connected to dental school, but I would like to share my experience which is quite similar.
My major is statistics which is an applied area of mathematics NOT science, and I am currently pursuing a PhD. However, I had not taken biology since I had taken AP biology in high school and got a 4 on the AP exam in 1997. So last semester I took the undergrad genetics course at NCSU (my only other science courses in undergrad were gen chem and gen physics which I had taken two semester of each at a cc in the academic year 2001-2002, note: I earned my undergrad in two years later.) So, I was told to watch out for the last two tests which had no statistics or quantitative questions. As you know there is classical, Mendelian, population, and molecular genetics. So on the first, molecular test I earned 88.5 and on the second molecular test I earned a 92.5 and the class averages were 78 and 67 respectively (hence I was 10.5 points above average on one test and 25.5 points above the average on the other, along with an A at the end of the class. And most students in the class were undergrad pre-med / pre-dental / biochem / whatever you call it majors. Hence, you do not have to be a science major to do well in dental school! In fact, I realized that I was pretty good at this. It comes to both your analytic and study habits.