Wait a minute, "the outcome is worth it, because dental academia will be in high demand soon." That's why you're interested in teaching? In the long run, you make less money than in private practice, due to researching (why you get the PhD) for long hours at an academic salary that is far less than private practice. Why else do you think schools cover tuition and give students a stipend? Read the MSTP forum; it's a long ride that should only be pursued for the love of basic science.
Anyway, lots of schools have them; Michigan, UCSF, etc. And you may not even need the PhD to pursue dental research/teaching, anyway. Many in academia now don't have one. I am interested, but I need far more good research experience than what I have before I even consider applying for it several years down the line.