I'm an RN and am headed in the direction of dental school. I originally had the intentions of graduating with my RN and then going on to medical school, but after getting into the clinical setting and actually seeing how much time physicians spend in the hospital, becoming a dentist was more appealing family wise as well as the kind of work they do. I also like the fact that you have the one on one relation with your patients as a dentist and the variety a dentist has (teaching, surgical, business, setting your patient load, etc). I feel that if I don't get into dental school I will more than likely go Family Nurse Practitioner (FNP) or Certified Registered Nurse Anesthetist (CRNA).
If you are interested in getting into medical school after nursing school, get your BSN and avoid an ADN program, just for the fact that it will not take you as long to get your four year degree that's required and you will not have that stigma of having gone to a Community College on the transcript. It sucks that some med schools, and dental schools look at that, but when you are a candidate among thousands of other applicants, something as small as having gone to a CC could kill you chances of getting into a program.
Good luck with your choices and GOD bless