Published in PLOS ONE in May 2025, researchers at Western University in Canada conducted the most comprehensive systematic review of mouth taping to date. They searched MEDLINE, Embase, and Google Scholar for studies published between 1999 and 2024 and identified only 10 studies with a combined total of 213 patients.

All 10 studies received low quality ratings on the Newcastle-Ottawa assessment scale, a standard tool for evaluating research rigor. Only 2 of the 10 studies demonstrated statistically significant improvements in apnea severity or blood oxygen levels. The remaining 8 showed no significant benefit.

Four of the ten studies specifically flagged that sealing the mouth shut could pose a serious risk of asphyxiation (suffocation) in people with nasal obstruction or those who might regurgitate stomach contents during sleep. The reviewers concluded that the evidence base is far too small and low-quality to support recommending mouth taping as a health intervention.

Published in the American Journal of Otolaryngology in late 2024, researchers conducted a scoping review searching PubMed and Embase for all published research on nocturnal mouth taping. Of 177 unique studies identified, only 9 met inclusion criteria - highlighting how little formal research exists.

The included studies varied widely in design, patient population, outcomes measured, and tape type used. The authors found no consensus on whether mouth taping provides meaningful health benefits. Study populations ranged from healthy volunteers to patients with mild, moderate, or severe sleep apnea, making comparisons difficult.

The researchers also analyzed the top 50 TikTok videos about mouth taping and found that the health claims made on social media dramatically exceeded what the scientific evidence supports. Many viral claims - such as improved facial structure, reduced anxiety, and weight loss - have no supporting research at all. The gap between social media hype and actual evidence was the central finding of the review.

Published in The Journal of Physiology in 2024, physiologist Ken O''Halloran wrote a scientific commentary examining the gap between the established science of nasal breathing and the unproven practice of taping the mouth shut during sleep.

The commentary highlighted that while nasal breathing is indeed beneficial - warming, filtering, and humidifying air while delivering nitric oxide to the lungs - it does not follow that forcing nasal breathing via tape is safe or effective. In one referenced study of 66 people with obstructive sleep apnea, those who depended on mouth breathing because their nasal passages were partially blocked experienced decreased total airflow when their mouths were taped. Their breathing got worse, not better.

O''Halloran concluded that considerably more research is needed before mouth taping can be recommended, and that the practice could be dangerous for the substantial portion of the population with some degree of nasal obstruction from allergies, a deviated septum, or chronic congestion.

Published in Healthcare in 2022, the study by Lee and colleagues at Chang Gung Memorial Hospital is frequently cited as evidence that mouth taping works. However, its design has significant limitations that prevent drawing broad conclusions.

The study included only 20 participants, all of whom had confirmed mild obstructive sleep apnea (AHI between 5 and 15 events per hour) and were known mouth breathers. There was no control group and no blinding - participants knew when tape was applied. The median AHI decreased from 8.3 to 4.7 events per hour, a modest improvement within the mild range.

The authors themselves described it as a "preliminary study." The results cannot be generalized to people with moderate or severe sleep apnea, to people without sleep apnea, or to the broad health claims made on social media. With only 20 participants and no control group, the findings could reflect placebo effects, night-to-night variability in sleep, or selection bias rather than a true treatment effect.

The American Academy of Sleep Medicine (AASM), the leading professional organization for sleep medicine in the United States, published a statement warning consumers against following viral TikTok sleep trends including mouth taping.

The AASM explicitly stated that mouth taping is not part of any clinical practice guideline for treating any sleep disorder. The organization has clinical practice guidelines for treating obstructive sleep apnea (recommending CPAP, oral appliances, or surgery), insomnia (recommending cognitive behavioral therapy), and other sleep conditions - mouth taping appears in none of them.

The AASM advised people to approach sleep with evidence-based strategies rather than advice from unvetted sources on social media. They emphasized that self-treating sleep problems with unproven methods can delay proper diagnosis and treatment of underlying conditions that may be serious.

Cleveland Clinic Health Essentials published an expert review of mouth taping featuring Dr. Brian Chen, a pediatric sleep medicine specialist. Dr. Chen stated directly that there is not strong enough evidence to support the claim that mouth tape is beneficial for health, and that it is not part of current clinical practice to treat any sleep disorder.

The review listed specific conditions that make mouth taping potentially dangerous: heart conditions, chronic allergies, nasal congestion or obstruction, enlarged tonsils, and deviated septum. For people with any degree of nasal obstruction - which includes a large portion of the general population - taping the mouth shut could restrict breathing to a partially blocked airway.

Additional risks noted included skin irritation from adhesive, difficulty breathing if congestion develops during the night, and the inability to breathe through the mouth in an emergency such as vomiting. The experts recommended that anyone concerned about mouth breathing during sleep should consult a doctor to identify and treat the underlying cause rather than applying tape.

The Sleep Foundation, a nonprofit organization that reviews sleep-related research and provides evidence-based recommendations, published an assessment of mouth taping for sleep that concluded the practice cannot be recommended.

Their review noted that the existing studies on mouth taping are characterized by very small sample sizes - typically 10 to 20 participants - with no large-scale randomized controlled trials. The data does not support mouth taping as a sound or safe clinical intervention for the general population of mouth breathers or people with sleep-disordered breathing.

The Sleep Foundation specifically warned against using mouth taping as a substitute for proven sleep apnea treatments like CPAP therapy. They noted that people who mouth-breathe during sleep often do so because of an underlying condition - such as nasal obstruction, allergies, or anatomical issues - that tape does not address. Self-treating with tape may delay proper medical evaluation and treatment of conditions that contribute to poor sleep quality.

Multiple clinical institutions including the Cleveland Clinic, Sleep Foundation, and Baylor Scott and White Health have published warnings about the psychological risks of mouth taping during sleep.

The sensation of having the mouth sealed shut can trigger claustrophobia and panic attacks, particularly in people with anxiety disorders or a history of panic disorder. When a person wakes up during the night and discovers they cannot open their mouth to breathe, the body''s fight-or-flight response can activate, causing rapid heartbeat, sweating, and intense fear. These anxious awakenings can themselves disrupt sleep quality, potentially making sleep worse rather than better.

People with post-traumatic stress disorder, generalized anxiety disorder, or those who have experienced choking or suffocation trauma may be especially vulnerable. This psychological harm is not accounted for in any of the small clinical studies on mouth taping, which typically exclude participants with psychiatric conditions. The risk applies to anyone trying mouth taping for the first time without knowing how their body will react during sleep.

Published in the Revue des Maladies Respiratoires in 2013, a review from ENT (ear, nose, and throat) specialists examined the medical causes of chronic mouth breathing and their proper treatments.

The review found that the majority of habitual mouth breathers have an identifiable structural or medical reason for not breathing through the nose. Common causes include a deviated nasal septum (present in some degree in up to 80% of the population), nasal polyps, enlarged adenoids or tonsils (especially in children), chronic allergic rhinitis, and chronic sinusitis.

Each of these conditions has established medical treatments: antihistamines or nasal corticosteroid sprays for allergies, septoplasty for a deviated septum, adenoidectomy or tonsillectomy for enlarged tissues, and endoscopic sinus surgery for polyps or chronic sinusitis. Taping the mouth shut does not treat any of these underlying conditions and may mask symptoms that warrant medical evaluation. If someone cannot breathe comfortably through their nose, the appropriate response is to find out why - not to force it with tape.

Published in Dermatitis in 2021, researchers reviewed the medical literature on skin reactions caused by adhesive tapes and bandages, examining both irritant and allergic contact dermatitis.

The review found that among patients who developed skin reactions from repeated adhesive tape use, 77% had allergic contact dermatitis - an immune-mediated reaction to chemicals in the adhesive. Common allergens include acrylate monomers, colophony (rosin), and rubber accelerators found in many types of tape. Heat, moisture, and prolonged skin contact all worsen both irritant and allergic reactions.

Nightly mouth taping creates all of these aggravating conditions: the tape stays on for 6-8 hours, the perioral area (around the mouth) produces moisture from breathing, and body heat accumulates under the adhesive. Over weeks or months of daily use, even people who initially tolerate the tape may develop sensitization. The skin around the lips is also thinner and more sensitive than skin on most other body parts, and repeated application and removal of adhesive can cause perioral folliculitis (inflamed hair follicles around the lips).