Add Yahoo as a preferred source to see more of our stories on Google. “The process is thought to help remove harmful bacteria and plaque from the mouth,” explains Michael J. Wei, D.D.S., Manhattan ...

Photo illustration by Oona Zenda of KFF Health News. Becky Carroll was missing a few teeth, and others were stained or crooked. Ashamed, she smiled with lips pressed closed. Her dentist offered to fix ...