It’s barely past opening time, and the waiting room at the Mercy Care clinic in downtown Atlanta is standing-room-only. Bruce Williams, 53, grimaces. He has a gum infection and needs surgery. But he doesn’t have dental insurance, or a job, or money. So he gets by as best he can, eating soft foods in tiny bites. “I have headaches all in the front of my head,” said Williams, trying to talk without moving his lips and mouth too much. “I’m just here to see what they can do.” Williams, who lives in Atlanta, is one of the estimated more than 4 million Georgians without dental coverage. Many haven’t seen a dentist in decades. Places like Mercy Care offer free dental clinics, but resources are limited