Today more people travel to Hungary for dental care than to any other country in Europe. The fascinating story of how Hungary became Europe's dental chair is a case study in medical tourism, which has become a growing multi-billion-dollar industry -- exploding in places as varied as India, Brazil, Korea, and Costa Rica -- as countries rewrite laws to compete for patients. Doctors and dentists have to run a business, but does globalization destroy the dream of high-quality universal health care? Sasha Issenberg, the acclaimed author of The Sushi Economy and The Victory Lab, goes...