This thread was certainly surprising to me. Dental work in the USA is just something that I really don't consider seriously anymore.
With proper research, dental care in lower cost countries really can be great and cost effective. If I lived in the USA, I would be getting care in Mexico. My aunt and uncle both had major work done along the Mexican border. They were frightened before going (despite getting many recommendations from their relatives in Airzona) but have been so happy with the work, it has worked out fantastic for them. They stayed in a hotel on the USA side of the border (Yuma area) and walked across to the dentist, all English facility.
I just got my teeth cleaned here in the Philippines, the cost was on the upper end here, about $19 (lol). The dentist was recommended to me by a group of Guam doctors who all use her. I was just in Cebu City, Philippines and researched dentists there as a favor for a Filipina friend as she just didn't know which dentist to go to. I found her a dentist that taught for many years at the dental school there and has a great reputation with the expats. Costs are in the neighborhood of 1/6 the USA, I would estimate. Also, they give you a choice of materials before any procedure where there are options, they know expats generally want the highest qualify materials (well, I sure do!). In fact, one of the classes this dentist taught was on dental ethics.
The super high end place in Cebu City, which is located in the premiere mall there and draws the highest quality dentists in the region and has a stellar reputation, is approximately 1/3 the cost of the USA, to give you an idea.
One other big difference that I noticed. I have been to the dentist multiple times in three different countries outside of the USA. In each case, it was the dentist who actually did my cleaning, not a dental assistant. I never had a dentist clean my teeth in the USA. At my last teeth cleaning in the USA in 2007, the dentist never even made an appearance!
The internet is a game changer and has made it easier to find quality medical professionals abroad.