I've heard more than one med student say they would just keep their Campbell's Biology book, because it could be used quickly to brush up on something quickly (especially if you are going to school with a limited science background). I'd assume it could come in handy for dental students as well.
Oh yeah, and for freshmen/sophomores who want to sell their old books: don't sell them back to your campus bookstore! They will rip you off like nobodies business (although apparently it's their business). They'll give you about 25 bucks for a $150 physics textbook and sell it used for $100. Go onto amazon, you'll get a better price. I never buy/sell books at the campus store, it's a huge scam.👎thumbdown👎