Buy an online copy of the adea guide to dental schools, it will show you what each school requires as it’s prerequisites.
Generally, most schools require:
A bachelors and
8 units of general physics with lab
8 units of general chemistry with lab
8 units of organic chemistry with lab
8 units of general biology with lab
3-4 units of biochemistry
All with a C or higher
Many of these schools also specify you need:
8 units of upper division reading/writing
4 units of calculus/statistics
All with a C or higher
Then some schools require, in seeming order of importance:
4 units of microbiology and or
4 units of anatomy and or
4 units of physiology
All with a C or higher