St Martin in the French Caribbean has a good reputation. Private dental work is very good in many places around the world. I know two people who had their teeth fixed while they were in India and they both had excellent work done.

edit - You could maybe find another reason to travel, one that you can get some sort of help with. Say you want to study the background of The Martians http://en.wikipedia.org/wiki/The_Martians_%28group%29 and try to blag a flight to Budapest.