Does mewing actually reshape your jawline?

No. There is no peer-reviewed clinical trial showing that pressing your tongue to the roof of your mouth, the technique millions know as mewing, reshapes an adult jawline. The American Association of Orthodontists said as much in January 2024, warning that the viral habit "oversimplifies the complexities of facial structure" and carries real dental risks when done aggressively.

What mewing actually is

Mewing is simple to describe: instead of letting your tongue rest low in your mouth or against your teeth, you hold it flat against the roof of your mouth, with your lips closed and teeth lightly together. Practitioners are told to hold this position for most of the day, sometimes for years, with the promise that sustained pressure will gradually remodel the jaw into a sharper, more V-shaped profile.

The name comes from John Mew, a British orthodontist who developed the underlying theory, called orthotropics, in the 1970s. He argued that modern mouth-breathing and poor tongue posture were reshaping faces for the worse, and that correcting posture early could guide jaw growth in a better direction. The idea sat on the fringe of dentistry for decades. It went mainstream only when his son, Mike Mew, began posting about it on YouTube and later TikTok, where it became one of the platform's most durable "glow up" trends, in the same family of viral body hacks as the pink salt trick.

A controversial family history

The Mews' own professional record complicates the pitch. Britain's General Dental Council stripped John Mew's dental license over a series of advertisements the regulator found misleading. His son fared worse: on November 6, 2024, the GDC's Professional Conduct Committee found Mike Mew's fitness to practise impaired by misconduct and removed him from the dentists' register. The case centered on an orthotropic treatment plan for a six-year-old patient, involving expansion appliances and neck gear, that the regulator said fell "far short of the standards expected of dental professionals." Reporting on the case described the child experiencing long, seizure-like episodes after prolonged device use. Mew appealed the ruling to the High Court.

What the evidence actually shows

Strip away the before-and-after videos and the research underneath is thin. Dr. Kam Aulak, a dentist who has commented on the trend, put it plainly: "To date, there is a lack of rigorous scientific studies that specifically investigate the effectiveness of mewing." The American Association of Orthodontists went further in its January 2024 statement. Its president, Dr. Myron Guymon, said that "while proper tongue posture plays a role in oral health and development, mewing oversimplifies the complexities of facial structure," adding bluntly that "there's no scientific evidence to support its claims of reshaping the jawline."

The biology explains why. Facial bone is genuinely responsive to sustained pressure, but mostly during childhood and adolescent growth, when bone is still being laid down and remodeled. Adult jawbone is far less plastic. That is why orthodontic appliances that reshape growing jaws are typically fitted in children and teenagers, not adults. When someone posts a dramatic adult transformation, the far more likely explanations are weight loss revealing existing bone structure, improved posture changing how the face is held, or simply a better camera angle and lighting.

The risks the videos leave out

Mewing is marketed as harmless because it is "just posture." The AAO's warning lists specific ways that framing is incomplete. Chronic, forceful tongue pressure against the teeth can loosen them, shift an existing bite out of alignment, and contribute to tooth wear over time. Altered tongue placement can also affect speech, in some cases requiring complicated orthodontic or speech treatment to correct. None of that is a reason to panic over relaxed, natural tongue posture. It is a reason to be skeptical of instructions to force the tongue hard against the palate for hours a day, especially for anyone currently in braces or other active orthodontic treatment.

What might genuinely help

There is a real, evidence-informed version of the underlying idea: myofunctional therapy. It addresses tongue posture, nasal breathing and swallowing patterns, but under professional assessment, with a therapist checking what a given mouth and airway actually need rather than applying one technique to everyone. Better nasal breathing and relaxed tongue posture are reasonable habits in their own right, tied to sleep quality and general oral health. They are a different claim from "this will carve you a new jawline," which is the part the evidence does not support, and it is a familiar shape for a dental trend: oil pulling made a similarly oversized promise from a genuinely minor habit.

Our take

Mewing borrows a real anatomical fact, that tongue posture and oral habits matter for development, and stretches it into a promise the research does not back for adults. The professional body that would know, the American Association of Orthodontists, has said plainly there is no scientific evidence for the jaw-reshaping claim, and the technique's namesake family has its own serious professional misconduct history. If your bite or jaw genuinely concerns you, an orthodontist can tell you what is actually changeable. A tongue exercise learned from a video cannot rebuild bone that has already finished growing.

This is general information, not medical advice. Talk to a clinician before changing anything, especially if you are pregnant, nursing, or managing a condition.