INGLEWOOD, Calif. — They came for new teeth mostly, but also for blood pressure checks, mammograms, immunizations and acupuncture for pain. Neighboring South Los Angeles is a place where health care is scarce, and so when it was offered nearby, word got around.

Doctors On Call For the second day in a row, thousands of people lined up on Wednesday — starting after midnight and snaking into the early hours — for free dental, medical and vision services, courtesy of a nonprofit group that more typically provides mobile health care for the rural poor.