I spoke to the Admissions Director and Assistant Director of Rutgers Dental School recently in person. They happened to visit my undergraduate campus, and I stopped by to network despite not applying to their dental program.
The general consensus is what
@periopocket said. Dental schools are looking for a 3.5+ GPA in a masters program that provides a lot of higher level science courses (i.e. immunology, biochemistry, anatomy and physiology, microbiology, cell biology, histology, pathology, and etc.) This does NOT warrant a masters in public health or any other masters with only 1-3 classes listed above. Essentially, you only want to aim for a 3.5+ GPA to show you can handle the higher level science courses and you improved from the sub 3.5 undergrad gpa.