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
You’re right. In the guide and according to the schools, usually a bachelors is not a “requirement,” at least on paper. Yet, as you probably know, most schools will only actually accept those with a bachelors, except if they demonstrate REMARKABLY high achievement after completing something like 90 semester/120 quarter credits (I forget the actual figures).