"Mouth taping" is a dangerous new trend where people tape their mouths closed during sleep to force them to breathe though their nose. Mouth taping not only doesn’t help you to breathe through your nose, it’s also highly dangerous. It can cause obstructed breathing and create other more serious sleep disorders like obstructive sleep apnea and sleep disruption. This is nothing a physician would ever recommend to a patient. Please, see a doctor and do not try diy remedies which cause more harm than good.