I've looked into dental school myself, and their admissions websites definitely say any other health profession's classes WILL NOT give you advanced standing in dental school and you'll have to start from the beginning. I believe that's the same no matter what health profession you choose. However, the prerequisite science classes you took (bio, chemistry) would probably count towards dental school prereqs for admission, if they were taken no more than 5 years ago. If those classes were taken more than 5 years ago, you'll have to take them again (at a community college I'd guess)
Your best bet is to take the DAT test before you make any decisions. That will tell you if you have a chance at dental school. You'll need at least a 17 score to meet the bare minimums. Also if your grades were less than stellar (like under a 3.0 GPA), I'd forget dental school to be honest.