What a bunch of losers, lol. I study very hard in dental school, but my gosh, just use your time wisely and you can do fine in school. I find that some people who go overboard with studying get to class, think they know it all, and then blow off what the professor says. It is far more important to pay attention to what is said in class (for some classes at least) and to pay attention to what is on slides, than to just try to "get ahead".
Dental school is a marathon, not a sprint, and I'm sure that ANYone can attest to that fact. If you are that gung-ho about being first in your class, then make wise use of your time, study hard, and do your best- but at the same time, find something that gives you a release. I play soccer, some party, some play video games, but whatever that is, find it and give yourself a break.
Most importantly, learn from your mistakes. Don't get pissed off with your professors when you do something wrong or miss a test question over something. Learn from the mistake, try your best not to make it again, and roll with the punches. It seems like you get knocked down again and again in dental school- the best students get back up again and try harder.