Does Mewing Actually Work? Evidence Review

The Mewing Question Everyone’s Asking

If you’ve spent more than five minutes on looksmaxxing TikTok, you’ve seen it: guys pressing their tongue to the roof of their mouth, claiming it’ll give them a chiseled jawline and better facial structure. Some before/after photos look dramatic. Others look like different lighting.

Mewing is probably the most debated topic in the entire looksmaxxing community. Half the internet swears it transformed their face. The other half says it’s complete pseudoscience. The truth, as usual, is somewhere in between, and it depends a lot on your age.

Let’s break down what the evidence actually supports and what it doesn’t.

What Mewing Is

Mewing is a tongue posture technique named after Dr. Mike Mew, a British orthodontist, and his father Dr. John Mew, who developed the orthotropics framework. The basic idea:

The technique:

1. Rest your entire tongue flat against the roof of your mouth (the palate) — not just the tip, the whole thing including the back third
2. Keep your lips sealed
3. Breathe through your nose
4. Keep your teeth lightly touching or very close together
5. Maintain this posture 24/7, including during sleep

The claimed benefits:

• Forward and upward development of the maxilla (upper jaw)
• Broader palate leading to a wider, more defined midface
• Improved jawline definition
• Better forward projection of the face overall
• Hollowed cheeks from proper tongue posture
• Improved breathing and airway

The underlying theory is that modern humans have underdeveloped jaws because we eat soft processed food, breathe through our mouths, and have poor oral posture. Mewing claims to reverse this by retraining your tongue to the “natural” resting position.

What Dr. Mew Actually Claims

It’s worth separating what Dr. Mike Mew actually says from what the internet claims mewing does. The two are different.

What Mew says:

• Proper oral posture influences facial development during childhood and adolescence
• Mouth breathing is detrimental to facial growth
• The tongue exerts force on the palate that can guide growth
• Adults can benefit but changes are much slower and more limited
• Mewing is not a replacement for orthodontic treatment in severe cases

What the internet says:

• Mewing can reshape an adult’s entire face in months
• You can get a “chad jawline” just from tongue posture
• Mewing is a free alternative to jaw surgery
• Dramatic before/after transformations are typical

The internet version overpromises dramatically. Mew himself is more measured, though his claims still exceed what mainstream orthodontics accepts. Worth noting: the British Orthodontic Society revoked Dr. Mike Mew’s membership in 2020, and in 2024 the General Dental Council struck him off the register for inappropriate and misleading treatment (Scottish Dental, 2024). That doesn’t automatically mean he’s wrong, but it means the professional orthodontic community doesn’t endorse his methods.

The Evidence: What Science Supports

Let’s go through what actually has scientific backing.

Mouth Breathing Damages Facial Development — SUPPORTED

This is the strongest piece of evidence in the orthotropics framework, and it’s not controversial among medical professionals.

Chronic mouth breathing during childhood is associated with:

• Long face syndrome (vertically elongated face)
• Narrow palate
• Recessed chin
• Open bite
• Poor midface development

Multiple studies have documented this. The most famous is the work by Egil Harvold in the 1980s, who experimentally obstructed nasal airways in monkeys and observed significant negative changes in facial development. In humans, epidemiological studies consistently link childhood mouth breathing with unfavorable facial growth patterns.

Bottom line: If you’re breathing through your mouth, switching to nasal breathing is genuinely beneficial — especially for kids. This part of the mewing framework has solid support.

Tongue Posture Influences Palatal Development in Children — PARTIALLY SUPPORTED

There’s reasonable evidence that the forces exerted on the palate by the tongue play a role in how the palate develops during growth years. Orthodontists have long recognized that abnormal tongue posture (like tongue thrust) can cause or worsen malocclusion.

Palatal expanders — devices orthodontists use to widen a narrow palate in kids — work on a similar principle: sustained force reshapes growing bone over time. The tongue exerts force in a similar direction, just more gently.

Bottom line: In children and adolescents whose bones are still developing, tongue posture probably matters. It’s plausible that consistent mewing during growth years could contribute to better palatal and midface development. The word “contribute” is doing heavy lifting here — we’re talking about one factor among many, not a magical jawline hack.

Mewing Can Restructure an Adult’s Face — NOT SUPPORTED

This is where the evidence falls apart.

Adult facial bones are fully fused. The midpalatal suture (the joint in the middle of your palate) typically fuses between ages 15-18 in males (Frontiers in Oral Health, 2025). After fusion, the forces your tongue can exert are nowhere near sufficient to move or reshape bone.

For comparison, palatal expanders for adults require surgical assistance (SARPE — surgically assisted rapid palatal expansion) because the fused suture can’t be moved with mechanical force alone. If a surgical device with hundreds of pounds of force needs surgical assist, your tongue isn’t going to do it.

As of 2026, there are zero randomized controlled trials on mewing in adults (Aesthetic Surgery Journal Open Forum, 2025). The entire evidence base is anecdotal — forum posts, YouTube transformations, and self-reported results.

What about those adult before/after photos? Most can be explained by:

• Lighting and angle differences (even a 5-degree head tilt changes jawline appearance dramatically)
• Body fat changes (losing 10-15 pounds reveals jawline definition that was always there)
• Natural aging and facial fat redistribution (male faces become more angular between 18-25 regardless)
• Improved posture (standing straighter changes your side profile)
• Masseter muscle development from intentional clenching
• Survivorship bias (people who see no change don’t post about it)

Bottom line: There is no peer-reviewed evidence that mewing restructures an adult’s facial bones. The theoretical basis for it doesn’t hold up given what we know about adult bone biology.

Mewing Improves Posture — PARTIALLY SUPPORTED

Proper mewing technique involves head positioning: chin slightly tucked, neck elongated, tongue on the palate. This naturally encourages better cervical spine posture.

Better neck and head posture can:

• Make your jawline appear more defined (forward head posture hides your jaw)
• Reduce the appearance of a “double chin”
• Improve your side profile
• Reduce neck and jaw tension

This is real, it’s noticeable, and it happens quickly. A lot of the “mewing results” you see are probably just posture improvement — which is still a win, just not a bone structure change.

Bottom line: Mewing’s postural component is legitimate and beneficial. Don’t discount this — improved posture is one of the easiest and most underrated looksmaxxing changes you can make.

Mewing Improves Breathing — LIKELY SUPPORTED

Nasal breathing (a core mewing principle) is better than mouth breathing. Period. The evidence for this is extensive and not disputed.

Nasal breathing benefits:

• Filters, warms, and humidifies air
• Promotes nitric oxide production (improves oxygen absorption)
• Reduces snoring and sleep apnea risk
• Supports better dental health (dry mouth from mouth breathing promotes cavities and gum disease)

Bottom line: If mewing gets you to breathe through your nose consistently, that’s a genuine health benefit regardless of whether it changes your face.

The Age Factor: This Is Key

Your age is the single most important variable in whether mewing could potentially affect your facial structure.

Under 12: This is the golden window. Facial bones are actively growing, sutures are unfused, and the palate is still expanding. Proper tongue posture, nasal breathing, and harder food during this period likely contribute meaningfully to facial development. Orthodontists (including skeptics of orthotropics) generally agree that oral habits during childhood matter.

Ages 12-18: Growth is slowing but not finished. Some sutures are fusing, others aren’t yet. Mewing during this window could plausibly have some effect on development, though it’s increasingly limited as you get older. This is also when orthodontic treatment is most effective.

Ages 18-25: The midpalatal suture is fusing or fused. Meaningful skeletal change from tongue pressure alone is extremely unlikely. You might see minor soft tissue changes (masseter development from the clenching component, postural improvement) but not the skeletal transformation the internet promises.

Over 25: Forget skeletal changes. Your bones are done growing. What you can get from mewing at this age: better posture, nasal breathing habits, maybe some masseter muscle tone. These are worth having, but they’re not going to give you a new jawline.

The Problems with Mewing

Even acknowledging the legitimate aspects, there are real issues.

It’s Overpromised

The gap between what mewing might do (slight developmental influence in kids, posture improvement, nasal breathing) and what the internet claims it does (total facial transformation at any age) is enormous. This overpromising leads to guys spending years on tongue posture expecting dramatic results that won’t come, when they could be using that energy on interventions that actually work.

It Can Cause Problems

Done incorrectly, mewing can lead to:

• TMJ (temporomandibular joint) pain from excessive clenching
• Headaches from jaw tension
• Uneven facial development if you’re pressing harder on one side
• Worsening of existing bite issues
• Tooth grinding (bruxism)

If you’re going to try mewing, do it gently. “Hard mewing” — pressing your tongue forcefully against your palate — is a recipe for TMJ problems. If you’re getting jaw pain or headaches, stop.

It Delays Real Treatment

Some guys with genuine skeletal issues (severe overbite, recessed maxilla) try mewing for years instead of seeing an orthodontist or maxillofacial surgeon. Mewing is not a treatment for malocclusion. If you have a real structural problem, see a medical professional.

The Community Can Be Misleading

Mewing forums and communities are echo chambers where the technique’s effectiveness is rarely questioned. Before/after photos are celebrated without scrutiny of confounding variables. Skepticism is dismissed. This isn’t a healthy epistemic environment for making decisions about your face.

So What Should You Actually Do?

If you’re a teenager: Breathe through your nose, maintain good tongue posture, eat harder foods, stand up straight, and see an orthodontist if you have bite issues. These are all good habits regardless of whether you believe in orthotropics.

If you’re an adult hoping for structural change: Mewing won’t give you a new jaw. If your jaw or midface bothers you, consult a maxillofacial surgeon or plastic surgeon. Jaw surgery, chin implants, or fillers are the evidence-based options for structural change in adults. In the meantime, getting to 12-15% body fat will reveal more jawline definition than mewing ever could.

If you’re an adult wanting easy wins: Adopt nasal breathing, fix your posture, and stay lean. These are the components of mewing that actually deliver visible results for adults, and they work regardless of what you think about orthotropics.

What you shouldn’t do:

• Spend money on mewing courses or coaching
• Use mewing devices that claim to accelerate results
• Hard mew aggressively
• Choose mewing over actual orthodontic treatment for bite issues
• Obsess over daily progress photos — the monitoring pattern itself can become unhealthy

The Balanced Verdict

Mewing contains some legitimate ideas wrapped in a lot of overclaiming. Nasal breathing is good. Proper tongue posture probably matters during development. Good posture visibly improves your appearance. These are real benefits.

But the idea that adults can restructure their facial bones by pressing their tongue to the roof of their mouth is not supported by evidence. The dramatic transformations you see online are almost certainly explained by other factors.

Take the good parts — breathe through your nose, stand up straight, mind your posture. Leave the magical thinking behind. And if you want real structural changes, talk to a doctor, not a forum.