Research by the Deloitte Center for Health Solutions found that 750,000 Americans traveled abroad in 2007 for some form of medical care. That number could rise to more than 6 million in the coming years, analysts say, as the trend continues to grow. Patients are looking to foreign medical facilities for care that includes dental work, surgery, and joint replacements, and all at lower costs. Critics worry, however, that language barriers and the inability for patients to return for follow-up care could stand in the way.