Just do your best on the DAT, apply and then see what you get. GPA and DAT are the most important factors, but not the only criteria dental schools look at in applicants.
I knew a guy in my class last year with 2.8 GPA and 17 DAT and yet, he made it into the dental school in Ohio. He's not sure what happened either. I'm not sure if he had a very unique PS or what, but he did have some unique backgrounds. He had a family to take care of, a wife and two kids, and he worked full time while going to school, so those might have been considered. So, you never know, but still, do your best on the DAT. That is the best thing you can at this point it looks like.
Good Luck!