I'm in the same boat, brother. Was a philosophy major in undergrad so had only a couple science courses. Since then I've been rocking it up and while my overall has improved slightly (because I have so many credits) my science gpa has gotten much higher. I have to believe that of the two reasons people do post bacs -- to change direction or to improve upon previously taken sciences -- our results are very highly regarded. A 4.0 the last 40 credit hours HAS to be a good thing.
But no, it's not the 3.9 3.9 22,22,22 the other posters had. But we've already fallen down and learned what it's like to have to pick yourself up and dust off. These guys haven't -- yet. It happens to everyone at some point or another and I wouldn't want it to happen to me in dental school. There isn't a safety net at that level...
Just my 2 cents. Mack