I agree with the previous posts
if your gpa sucks the big one:
1. rock the dat (I mean 20's across the board if you can, study your butt off for them!)
2. get involved in research, doesn't even have to be science related, just something of interest to you (demonstrates ability to work with a team, responsibility, etc)
3. community outreach, community outreach, community outreach (demonstrates your desire to help others)
4. intern at a dental office (shows true interest in field)
5. awesome, unique personal statement: search yourself for specific unique strengths that may separate yourself from other applicants, and somehow connect them to why you want to be a dentist . SELL YOURSELF, and BE POSITIVE (avoid writing negatives which includes any explanations of bad grades, etc). if an adcom has a problem with anything on your file, let them ask you at your interview! don't sell yourself too short too early on these personal statements (or on any part of the aadsas for that matter). get everyone and their moms to critique your statement. make it GOOD because often times the subject matter of the statement is what drives the adcoms interview questions, comments, etc.
6. good letters of rec : for academic letters doesn't even have to be from classes that you received an "A" in (I requested letters from profs of classes that I got a "B" or better, and received many offers.)
all in my opinion.....