I'm currently in graduate school, I have worked with hematopoitic stem cells (bone marrow derived). Stem cells are where science is heading, no matter what field, from cancer to dentistry. Pretty much any disease is best treated at its root, which is in the precurser cells or way back at stem cell level. I know there is a lot of reaserch going on in dentistry in order to understand stem cell contribution to oral health and using it to prevent/treat oral disease. I think there are stem cells that reside in the base of our teeth. So take the class, Its all about stem cells now.......
good luck.