Not sure if you've been to BKK yet, but I just got back from a great trip to Bangkok and Ayutthaya. I used a tour organizer called BKK Tours (http://www.bkktours.com), run by a husband and wife team. They specialize in organizing tours for singles and small groups and were just fantastic! They have a lot of positive reviews on TripAdvisor and will tailor your tour to your interests.
I have been reading that, like Bumrungrad for medical tourism, there are many qualified dentists in Bangkok who can do root canals, crowns, veneers,...
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Relatives and friends of mine used the Bangkok Dental Hospital for all their more complex treatments. They say it's really good and cheap compared to...