Bill Thompson’s wife had never seen him smile with confidence. For the first 20 years of their relationship, an infection in his mouth robbed him of teeth, one by one. “I didn’t have any teeth to smile with,” the 53-year-old of Independence, Missouri, said. Thompson said he dealt with throbbing toothaches and painful swelling in his face from abscesses for years working as a cook at Burger King. He desperately needed to see a dentist but said he couldn’t afford to take time off without pay. Missouri is one of many states that do not require employers to provide paid sick leave. So, Thompson wo…