Rather than spend a lot of money on a "new" camera, consider buying a good quality older camera. KEH.com will sell you a good quality used Canon 20D EX+ condition for 285.00 today (just checked their site). You could spend $1000.00 or more for a Rebel or a new 60D, but the 20D will do everything you want to do with it just fine - from intra-orals to weddings if you want to.
Use the money you save on the body to buy the 100mm macro version 1 ($415.00 used in EX condition) , and a Canon Macro ring light LN- $484.00. (which you will need anyway) You won't get a better setup than that for as little money... that works! KEH rates their equipment better than anyone in the business so you're safe with those ratings. ..and like i said I just went to KEH.com and did the search and all of that is there right now. They sell stuff pretty quickly though so if you want it - better buy it now.
I know - i know - that sounds like its costing you the earth - but in reality its a bargain for what you get. There are all sorts of compromise cameras out there but in the long run you'll be throwing good money after bad. The "dental" photography suppliers have figured out how to extract as much from you as they can on cheap crap and workarounds - or soak you (over $5000.00) for a similar setup on a 60D. All in the name of "post sales service". Save your money - buy a book. Its just that easy! Plus you have the forum to rely upon to help you get started.