As for sleep, a 2014 study on obstructive sleep apnea patients found that a chin strap “does not improve sleep disordered breathing” and is “ineffective in improving snoring.” ...

Researchers reviewed the literature on nocturnal mouth-taping and evaluated claims made on TikTok about the benefits of mouth-taping during sleep.

Chin straps alone have not been proven to be effective in treating obstructive sleep apnea. Mouth breathing can contribute to sleep disorders, but sleep experts do not recommend using chin straps ...