Reviewers screened 120 mouth taping studies, found little support

213 patients. That is the total across ten studies included after reviewers screened 120 articles on mouth taping for sleep and breathing, in work that searched MEDLINE, Embase and Google Scholar from February 1999 to February 2024.

The review included randomized controlled trials and prospective studies only, with objective and subjective outcomes. Two of the ten showed statistically significant improvement in apnea markers such as apnea-hypopnea index or oxygen desaturations. Other included studies showed no differences with mouth taping and discussed potential risks including asphyxiation with nasal obstruction.

Many studies excluded anyone with nasal obstruction or pathology. Common causes of mouth breathing listed in the review include allergic rhinitis, adenoidal and tonsillar hypertrophy and deviation of the nasal septum. The authors say further studies are required to clarify any clinical benefit. What the optimal patient selection, tape type, duration and safety monitoring would be remains unknown, if any benefit exists.

A study published in JAMA Otolaryngology Head and Neck Surgery in 2024 looked at airflow during mouth occlusion in more than 50 patients. Overall airflow improved but the effect was not uniform, and some patients with the worst airflow had distinct worsening with mouth occlusion. Small nonrandomized and uncontrolled studies of mouth taping show a wide range of responses, with possible improvement in snoring and sleep apnea in some mild cases of airflow limitation.

That uneven pattern matters for anyone reaching for tape at bedtime. Limiting airflow with mouth tape can be harmful for those with a narrowed or obstructed airway, and may increase cardiovascular strain from oxygen drops during sleep. People with existing cardiovascular disease or a known diagnosis of sleep apnea are advised to avoid mouth taping. Sleep disruption from apnea can cause excessive fatigue, sleepiness, insomnia and cognitive problems.

Obstructive sleep apnea is usually treated in adults with a continuous positive airway pressure machine, but adherence is poor for many people due to discomfort. That gap helps explain interest in simpler routines. “We don’t have a lot of good, quality evidence to support mouth taping,” a sleep clinician interviewed by CU Anschutz said. Sleep clinicians note nasal breathing may help some people with mild limitation, but effects vary by individual.

How mouth taping affects long term cardiovascular, cognitive and quality of life outcomes is not shown in the evidence reviewed. For now, what to watch is whether larger trials with clear safety screening change the picture, and whether guidance distinguishes mild snoring from diagnosed breathing disorders during sleep.

For a slow evening, the steadier path is assessment first and tape last, with attention to how the nose, breath and morning feel actually respond.