On a day in 1985, a young woman made an appointment with a highly-recommended dentist. She was in her 20s; the dentist, at 35, was a few years older than his patient. Over the next 30 years, the woman trusted her dental health to the dentist. With his professional skill, he kept her teeth and gums healthy; provided her with fillings; installed a couple of crowns; and deftly and painlessly completed a root canal.