What should I do? (post-bacc)

I would recommend taking your prereqs at a 4 year University. It's not that you won't get in with CC credits, but it does put you at a disadvantage. As Dental School becomes more and more competitive, you need every advantage you can get. Some schools will reject you right away based on your CC credits. Most have a limit to how many CC credits they accept. I know based on experience.