Mewing is a technique where you flatten your tongue against the roof of your mouth and hold it there, with the goal of reshaping your jawline and face over time. The term comes from British orthodontist John Mew, though he didn’t coin it himself. It spread through online communities of people experimenting with his ideas about “jaw posture” and facial development, and it has since become one of the most popular DIY facial aesthetics trends on social media.
Where the Term Comes From
John Mew began promoting tongue posture techniques in the 1970s as part of a broader approach he called “orthotropics,” which he positioned as an alternative to traditional orthodontics. His son, Michael Mew, continued developing and promoting the method online. Orthotropics was originally intended for young children whose jaws are still actively growing, not for adults looking to reshape their faces.
The term “mewing” was coined by internet users, not by the Mews themselves. It caught fire on YouTube, Reddit, and TikTok, where before-and-after photos and transformation claims drew millions of viewers. The professional fallout for the Mews has been significant: Britain’s General Dental Council revoked John Mew’s dental license in 2019, and Michael Mew was expelled from the British Orthodontic Society in 2022, though he continues to practice as an orthodontist.
How the Technique Works
The basic idea is to rest your entire tongue, including the back third, flat against the roof of your mouth (the palate) while keeping your lips together and your teeth lightly touching or close together. You breathe through your nose. Proponents say this should become your default resting tongue position, maintained as many hours of the day as possible.
The theory behind it draws on a real principle in bone biology: bones remodel in response to sustained pressure. Your tongue generates a surprising amount of force. During swallowing alone, it can push with roughly 5 pounds of pressure, and the average person swallows 500 to 1,200 times per day. In theory, that repeated force against the palate could nudge the upper jaw forward and outward over time, producing a wider palate, more defined cheekbones, and a stronger jawline.
Does It Actually Change Your Face?
This is where the gap between theory and evidence gets wide. No peer-reviewed clinical trials have tested whether mewing, as practiced by its online followers, produces measurable changes in adult facial structure. A review published in the Journal of Oral and Maxillofacial Surgery concluded that while some of the underlying concepts are plausible, mewing “is not based on sound scientific evidence” that would make it a viable alternative to established treatments.
There is some clinical evidence that tongue pressure can influence the upper jaw, but it comes from a very different context. In one documented case, an orthodontist used a specialized tongue appliance combined with a palate-expanding device to move the upper jaw forward in an adult patient over 24 months. The key difference: that involved custom orthodontic hardware, professional supervision, and deliberate loosening of the sutures that connect the upper jaw to the rest of the skull. Simply pressing your tongue to your palate on your own is not the same procedure.
Age matters enormously. In children and teenagers, the bones of the face are still growing and the sutures between skull bones haven’t fully fused. Tongue posture during these years likely does influence how the face develops. In adults, the common view among maxillofacial surgeons is that the upper jaw cannot be meaningfully moved without surgical or mechanical intervention after growth has stopped.
What About Breathing and Sleep?
Some mewing advocates claim the technique can reduce snoring, improve nasal breathing, and even help with sleep apnea by opening the airway. These claims are entirely anecdotal. No studies have tested whether mewing affects airway volume or sleep-disordered breathing. Encouraging nose breathing over mouth breathing is generally sound advice on its own, but attributing respiratory improvements to tongue posture specifically goes beyond what any evidence supports.
Risks of Doing It Wrong
Mewing sounds harmless, but the American Association of Orthodontists warns that improperly forcing your tongue into unnatural positions can cause real problems. Uneven pressure on the palate can push some teeth forward while leaving others in place, creating gaps or crooked teeth. It can also alter how the upper and lower teeth fit together, potentially causing an underbite, overbite, or open bite.
Jaw joint pain is another concern. A misaligned bite places stress on the temporomandibular joint (TMJ), which can lead to chronic pain, clicking, and difficulty opening the mouth fully. Some people also develop speech difficulties when their bite changes. The AAO notes that if mewing creates or worsens these misalignments, the corrective treatment that follows is often more complex and expensive than whatever problem the person was trying to fix in the first place.
Common technique mistakes that increase these risks include pressing the tongue unevenly across the palate, letting the tongue push against the front teeth, and neglecting to engage the back third of the tongue. These errors are easy to make without professional guidance, and there is no standardized way to learn the technique correctly.
Realistic Expectations
Online mewing communities suggest timelines of one to three months for noticeable changes in teenagers, three to six months for people aged 18 to 25, and six months to a year for those over 25. These timelines are self-reported and unverified. Many dramatic before-and-after photos online involve changes in lighting, camera angle, weight loss, or natural maturation, particularly in teenagers whose faces are still developing regardless of tongue posture.
If there is a visible effect in adults, it likely comes from changes in soft tissue rather than bone. Holding your tongue against the roof of your mouth tenses the muscles under the chin and along the jaw, which can temporarily reduce the appearance of a double chin and create a slightly more defined jawline. This is a postural effect, similar to how standing up straight makes your stomach look flatter. It disappears the moment you stop doing it, which is a very different thing from the permanent skeletal remodeling that mewing communities promise.