MNJU - I know this may sound crazy, but I would open the yellow pages and call every single dentist, cosmetic dentist, etc... in the book and tell them you have no insurance (your story) and are looking for a charity case. I'm sure ONE of them is bound to cut you a deal or do it for free.
If you don't mind it being "publicized" and not one of them says they'll help you then I would write to your local news (call them or email) and they'll put it on the news (I'm tellin you they will prob. lol) and someone will help you.
Let me know how it works out for ya - say your prayers as well