What Is Mewing, and Does It Actually Work?

Mewing is an informal practice of resting the tongue flat against the roof of the mouth, promoted online as a way to sharpen the jawline and reshape the face. People who ask what is mewing are usually referring to a social media trend that grew out of “orthotropics,” a controversial orthodontic philosophy developed by the British orthodontist John Mew and continued by his son Mike Mew.^[1][2]

Professional bodies say the claims are unsupported. The American Association of Orthodontists (AAO) stated in January 2024 that there is no scientific evidence that mewing reshapes the jawline, and that its potential risks outweigh any unproven benefits.^[1] Mike Mew was erased from the UK dentists’ register in November 2024 after a General Dental Council (GDC) panel found that his treatment of two child patients was not clinically indicated, and the High Court dismissed his appeal in May 2026.^[3][4] Those proceedings concerned his clinical practice, not the tongue-posture habit by itself.

Origins and the term

John Mew, a British orthodontist, promoted orthotropics from the 1970s as an alternative to conventional orthodontics, according to WebMD. The approach holds that tongue position, mouth posture and breathing influence how the face grows in children, and that teeth and jaws can be guided by changing those habits. WebMD reports that the term “mewing” itself came from online communities rather than from the Mews.^[2] Orthotropics was originally intended for young children whose jaws are still growing, a point that matters when the practice is marketed to adults.^[2]

Science Focus describes the claims as including a sharper jawline, straighter teeth, relief from jaw pain, and less snoring and sleep apnea.^[5] John Mew lost his dental license in 2019, and his son Mike was expelled from the British Orthodontic Society in 2022, according to WebMD.^[2]

How the practice is described

WebMD summarizes the instructions circulated online: with the mouth closed, the tongue rests on the palate with its tip behind the front teeth, and the teeth touch lightly without clenching. Some versions recommend holding the position for 10 to 20 seconds, repeating it several times a day, and breathing through the nose. Followers say visible change could take years.^[2] None of the sources reviewed here describes a protocol that has been validated in trials, and versions of the instructions differ.

Why it spread

The trend moved through short-video platforms, often alongside “looksmaxxing,” a loose term for do-it-yourself efforts to improve facial attractiveness. Before-and-after images circulate without clinical verification, and the audience often includes teenagers and young men, who may feel pressure about appearance. This is a case study in how health claims move through social media distribution faster than they can be tested, a theme the AAO itself raised when it noted that online theories often spread before they have been scientifically tested.^[1] Readers judging such content can use the habits described in this explainer on critical thinking.

What the evidence shows

No source reviewed here identifies a study showing that mewing changes the shape of the jaw or face. WebMD states that there is “no serious research” showing that mewing changes jawline shape, and that support is mostly anecdotal.^[2] Science Focus quotes Dr. Kam Aulak as saying there is a lack of rigorous scientific studies investigating whether mewing is effective, and adds that some research links oral posture to jaw development in general but not to mewing’s specific claims.^[5] Critics also note that genetics largely determines facial structure, so tongue posture alone is unlikely to produce major change.^[5]

The AAO acknowledges that proper tongue posture matters for oral health and development, but says mewing oversimplifies facial structure.^[1] The distinction is important. A relationship between oral habits in growing children and development is a plausible research question, and a claim that a posture exercise reshapes an adult face is a different and untested one. WebMD adds that adults whose bones have stopped growing are unlikely to see structural changes.^[2] Because facial growth takes years, any fair test would also need long follow-up. A well-designed clinical trial would take the form of a randomized controlled trial with standardized photographs or scans and a comparison group, and none was found in the sources reviewed. Without such data, individual before-and-after images cannot separate the effect of posture from normal growth, aging, weight change, lighting and camera angle.

Safety concerns

The AAO warns that chronic pressure from forcing the tongue into unnatural positions may loosen teeth, misalign the bite and increase tooth wear. It also warns that altered tongue placement may affect speech clarity, and that resulting problems may require complex orthodontic correction.^[1] WebMD describes the habit as probably harmless if it does not involve clenching, but repeats the AAO’s caution against trying to move teeth or jaws without professional guidance.^[2] Science Focus says mewing is unlikely to cause serious harm but that excessive force may strain the jaw, neck or facial muscles and may interfere with braces or other orthodontic treatment.^[5] The sources therefore agree that a gentle, relaxed posture is low risk and that forceful pressure is the concern.

The General Dental Council case

Mike Mew’s regulatory history is separate from the evidence on tongue posture, but it shaped how the movement is viewed. A GDC Professional Conduct Committee found in November 2024 that his fitness to practice was impaired by misconduct and ordered his name erased from the Dentists’ Register. The hearings ran for 46 days between November 2022 and November 2024.^[4] The case concerned treatment of two child patients between 2013 and 2019, and the GDC ruled that the treatments were not clinically indicated, were not in the patients’ best interests, and were liable to cause harm.^[3]

According to the High Court judgment, one patient was six years old in 2016 when orthotropic treatment was recommended despite a normal bite and normal craniofacial development, and expansion appliances caused a traumatic ulcer, which the panel found proved harm. The panel also found that a 2017 YouTube video contained inappropriate and misleading claims made without adequate objective evidence, including an implication that treatment could increase a child’s intelligence.^[4] News reports on the decision described a six-year-old patient who had seizure-like episodes while using the appliances.^[6] Mew criticized the GDC, saying it was more concerned with protecting the orthodontic industry than children, as reported by DentistryIQ.^[6]

Mew appealed. On May 15, 2026, a deputy High Court judge dismissed the appeal in full, finding the committee’s determination correct in all material respects, and ordered Mew to pay the GDC’s costs of the appeal.^[4] Those findings concern specific treatments of children with appliances. They are not findings about the simple resting-tongue habit.

What orthodontists recommend

The AAO considers orthodontic treatment the safest and most effective option for jaw misalignment and cosmetic concerns, and advises against relying on unproven online trends to change facial features.^[1] WebMD notes that dentists sometimes use similar concepts as one part of a structured treatment plan for sleep apnea or misaligned teeth, and advises consulting a dental professional about any jaw, bite or sleep concern.^[2] People who are concerned about bite problems, jaw pain or breathing can ask a licensed orthodontist or dentist for an evaluation. For related reading on how public messaging about health practices is judged, see this explainer on what makes public health advice change behavior.

FAQs

What is mewing? It is a practice of resting the tongue against the roof of the mouth, promoted online as a way to reshape the jawline, and it is derived from orthotropics.

Does mewing work? No rigorous study shows that it changes jaw or facial shape, and the AAO states there is no scientific evidence for the claims.

Who invented mewing? It is named after orthodontist John Mew, who promoted orthotropics from the 1970s, though WebMD says the term itself came from online communities.

Is mewing safe? A relaxed posture is probably harmless, according to WebMD, but the AAO warns that forced pressure may loosen teeth, misalign the bite and affect speech.

What happened to Mike Mew? The GDC erased him from the dentists’ register in November 2024 over treatment of two child patients, and the High Court dismissed his appeal in May 2026.