William Stork needs a tooth out. That’s what the 71-year-old retired truck driver’s dentist told him during a recent checkup. That kind of extraction requires an oral surgeon, which could cost him around $1,000 because, like most seniors, Stork does not have dental insurance, and Medicare won’t cover his dental bills. Between Social Security and his pension from the Teamsters union, Stork said, he lives comfortably in Cedar Hill, Missouri, about 30 miles southwest of St. Louis. But that cost is significant enough that he’s decided to wait until the tooth absolutely must come out. Stor...