Preparing for Dental School?

<p>I will be attending UC Berkeley in Fall 2008 as a freshmen.
My current plan is to go to Dental School after graduation.
Can anyone tell me ANYTHING about preparing for Dental School?
Like how hard it is, what major people are usually in, etc..
I heard a lot of people quit because it's hard to get a good GPA, so I am curious about it.</p>