If your GPA is too low I would recommend getting a masters in either some science area like chemistry or biology... or getting a masters in public health... either would be good for dental school. I had to take this route as well and was just accepted this year. If you are thinking about getting a masters, they do require you to take the GRE ...it's extremely easy compared to the DAT though... I remember only studying for a day or two before I took it. Grad school is much easier than undergrad in my experience, for the simple fact that there are no busy work assignments and everything is straight forward. If your science gpa is low though, definitely don't do the MPH, get a chemistry or biology masters (biology would be of more benefit to you in dental school).