TORONTO — Canadian researchers say there's no evidence that mouth taping has any health benefits and warn that it could actually be harmful for people with sleep apnea.Some social media ads and celebrity claims say that putting tape over the lips can help people breathe through the nose while sleeping, and thereby reduce snoring and improve rest.The senior author of a study published Wednesday in the journal PLOS One said mouth taping could be dangerous for people with sleep apnea — a serious condition where breathing stops and starts while sleeping — and many may not even realize they have it."There's a large proportion of people out there who have undiagnosed sleep apnea, possibly severe sleep apnea," said Dr. Brian Rotenberg, who is an otolaryngology specialist at London Health Sciences Centre, St. Joseph's Health Care London and Western University."When you literally tape your mouth shut and your airway is already being blocked somewhere behind that, you've now blocked off basically half of your airway,"…

TORONTO — Canadian researchers say there's no evidence that mouth taping has any health benefits and warn that it could actually be harmful for people with sleep apnea.