Look into SMP's or formal post-bacc programs that you can enroll into and raise your GPA.
1) Rutgers Univ. has MBS program that is specific for predental students like you
2) Temple also offers a post-bacc (guaranteed admission as far as I know, but requires an interview for an entrance into their postbacc program)
3) GMU/Georgetown has a postbacc
4) VCU CERT
5) BU - Oral Health Science
Take the DAT once you are finished with SMP or Post-bacc because these programs will help you prepare for DAT as well.