Why a dentist is the right person to answer this — and why the internet got it half right
Mewing arrived as an internet phenomenon, not a clinical one. Its promise — a sharper jawline, better cheekbones, a transformed profile, all from where you hold your tongue — spread because it is free, it feels plausible, and the before-and-after photos are compelling. Most of those photos are a change of camera angle, posture and lighting, not bone.
But dismissing the whole idea would be lazy, and it would miss something real. The thing underneath mewing — resting tongue posture, nasal breathing, how the mouth and airway develop — is a legitimate and long-standing area of dentistry, and central to whole-health dentistry. The internet took a real principle and stretched it into a transformation promise. Our job here is to give you the honest middle: what good tongue posture genuinely does, what it cannot do, and when the thing you are actually looking for is a clinical conversation rather than a YouTube technique.
We can give that answer cleanly because this sits squarely in dental territory — the development of the jaws, the bite, the airway, and the soft tissues around them. A clinician with a Masters in Aesthetic & Restorative Dentistry thinks about the long-term smile view by default: not how a face looks in a held pose today, but how the bite, the airway and the smile function and age over decades.
What mewing actually is
The term describes resting the tongue flat against the roof of the mouth — the whole tongue, including the back third, not just the tip — with the lips gently closed, the teeth lightly touching or just apart, and breathing through the nose. That is it. The claim is that holding this posture consistently, over months and years, changes the shape of the face.
Stripped of the hype, the genuinely useful core is this: your resting posture is where your mouth spends most of its time. You eat for perhaps an hour a day; you rest the rest of it. So the default position of your tongue, lips and jaw — and crucially whether you breathe through your nose or your mouth — is not trivial. It is the dominant influence on the oral environment. That part is real.
What good tongue posture may genuinely support
Here is the honest list — framed, deliberately, as "may support," because that is what the evidence allows. None of these are transformation promises.
Nasal breathing. Proper tongue posture goes hand in hand with breathing through the nose rather than the mouth. Nasal breathing filters and humidifies air, supports better sleep quality, and keeps the mouth from drying out overnight. This is the most worthwhile thing in the whole conversation, and it has almost nothing to do with jawlines.
A less dry, healthier mouth. A mouth that rests closed, breathing through the nose, stays moist. Saliva does its protective work. Chronic mouth-breathing dries the tissues and shifts the oral environment in ways we see clinically — more plaque, more gum irritation, worse morning breath.
Jaw and muscle comfort. A settled resting posture, with teeth apart rather than clenched, can reduce some of the daytime muscle load that feeds into jaw tension. It is not a treatment for jaw-joint (TMJ) disorders, but resting posture is part of the picture we look at.
Swallowing pattern. Where the tongue rests relates to how you swallow. In some people an immature swallowing pattern pushes the tongue forward against the teeth, which has orthodontic consequences worth assessing.
Notice what is and is not on that list. Breathing, comfort, oral health: plausibly supported. A new jawline: not.
What mewing cannot do — the honest limits
This is the section the viral videos leave out, and it is the most important one.
It cannot reshape an adult's facial bones. Once the facial skeleton has matured, tongue pressure does not remodel the jaw, cheekbones or chin. The forces involved are nowhere near what would be required, and the bones are no longer growing. Any adult "before and after" showing a transformed bone structure from tongue posture alone is showing you posture, angle and lighting — not skeletal change.
It is not orthodontics. Mewing cannot straighten crowded teeth, close gaps, or correct a bad bite. Those are tooth-movement problems that need controlled, measured force over time — which is what orthodontic treatment provides and tongue posture does not.
It carries a real risk if done wrongly. Aggressive, forceful "hard mewing" against the teeth can, in principle, apply unwanted pressure to teeth and the jaw joint. The internet version — push hard, all day, for a jawline — is the version most likely to do harm and least likely to do good.
The child-versus-adult distinction is everything. In a growing child, tongue posture, nasal breathing and oral habits genuinely influence how the jaws and airway develop — which is exactly why early assessment matters. In a fully grown adult, the same habits support function and health but will not redraw the face. Most of the disappointment around mewing comes from adults expecting a child's developmental outcome. Our guide to mewing results sets out what the evidence actually supports.
Where mewing overlaps with real airway dentistry
This is the part worth your attention, because it is where a fascination with mewing often points at a genuine, treatable issue.
People drawn to mewing frequently have one thing in common: they are, or were, mouth-breathers. They sense that something about their breathing, their sleep or their jaw development was not quite right — and they are not wrong. But the answer is not a tongue exercise. It is an assessment of the airway and the bite by someone qualified to look — the core of airway dentistry.
At Dental & Wellness London we approach orthodontics with the airway in mind, not just the alignment of teeth. We believe in arch expansion where possible and a non-extraction method — looking at how the jaws and arches can be developed or supported rather than reflexively removing teeth and narrowing the mouth. A narrow arch and a crowded airway often travel together. Where there is a genuine developmental or breathing concern, the right tools are clinical — orthodontic arch development in suitable cases, myofunctional therapy to retrain the muscles and swallowing pattern, and onward referral where the issue is medical. We design with your future in mind, because the way the jaws and airway are set up has consequences that play out over a lifetime, not a season — and a smile built on a healthy, open airway is one that remains youthful with time in a way a cosmetically-camouflaged one is not.
So if mewing brought you here because you suspect your breathing or jaw development is the real issue, that instinct is sound. The technique is not the answer — but the assessment it points you toward might be.
A sensible verdict — what we tell patients
If you want the practical version: adopting a relaxed, correct resting tongue posture and breathing through your nose is a good, free habit with real benefits for breathing, oral health and comfort. Do it gently, as a resting position, not a forceful exercise. Expect benefits to your function and how your mouth feels — not a new bone structure.
If your real concern is crowded teeth, a recessed or asymmetric jaw, poor sleep, or a breathing problem, those are clinical questions, and mewing is not the treatment. We would rather you knew that now than spent two years pressing your tongue against the roof of your mouth waiting for a result that the anatomy will not give. We say no to the transformation promise so we can say yes to the things that genuinely help.
How this is assessed at DWL
A functional and airway-aware assessment looks at your bite, the width and shape of your arches, your resting posture and swallowing pattern, your breathing, and where relevant your sleep. It is a dental and integrative conversation, not a single technique. Depending on what we find, the path might be orthodontic arch development in suitable cases (our Invisalign treatment is Express £2,200 · Moderate £3,400 · Unlimited £4,500–£4,900, depending on complexity), myofunctional retraining, simple habit and posture guidance — or, often, the reassurance that your function is fine and no treatment is needed.
Orthodontic and Invisalign consultations are free; otherwise we begin with a free 20-minute discovery call, then a dental examination (£65) where clinically needed. As with everything here, we set out what we find, what it would involve, and what it would cost in writing before anything is decided — and where the right answer is "no treatment," we say so.
Frequently asked questions
Does mewing actually work?
For function — supporting nasal breathing, oral health and resting comfort — good tongue posture is genuinely worthwhile. For the viral claim of reshaping an adult's jawline or face, no: tongue pressure cannot remodel mature facial bone. Most dramatic adult mewing before-and-afters are posture, angle and lighting.
Can mewing change my jawline as an adult?
No. Once the facial skeleton has matured, tongue posture will not change its shape. In a growing child, tongue posture and nasal breathing do influence jaw and airway development, which is why early assessment matters — but that developmental window has closed in adults.
Is mewing bad for your teeth?
Gentle resting posture is not. Forceful "hard mewing" — pushing the tongue hard against the teeth — can apply unwanted pressure to teeth and the jaw joint and is best avoided. Posture should be a relaxed resting position, not a strenuous exercise.
What is the correct tongue posture?
The whole tongue, including the back, resting lightly against the roof of the mouth; lips gently closed; teeth lightly touching or just apart; breathing through the nose. The breathing part matters most.
Should I do mewing or see a dentist?
If you simply want better resting posture and nasal breathing, adopt the habit gently. If your real concern is crowded teeth, jaw development, sleep or breathing, that is a clinical question — an airway-aware dental assessment will tell you what is actually going on and what, if anything, is worth doing.
Does mewing help with sleep or breathing problems?
It may support nasal breathing, which helps sleep quality. But a genuine breathing or sleep problem needs proper assessment — and where it points to a medical sleep condition, that is a referral to sleep-medicine specialists, working alongside rather than in place of dental care, not a tongue technique.
If mewing brought you here, the real question might be your airway
The most useful thing a fascination with tongue posture can do is point you toward an honest assessment of how your jaws, bite and airway actually work. That is a conversation we have every week — calm, thorough, and without a transformation pitch.
Orthodontic / Invisalign consultation: free. Otherwise, a free 20-minute discovery call, then a dental examination (£65) where clinically needed.
Phone: 020 8127 4567
WhatsApp: +44 7974 910222 (8am–7pm)
Hours: Monday–Friday, 8am–7pm, by appointment. No Saturday or walk-in appointments.
Address: Dental & Wellness London, 222 Essex Road, Islington, London N1 3AP.
Assessed by Dr Vishal Patel (Invisalign Diamond II Provider, GDC 103127) and the integrative team. Rated 4.7★ from 300+ Google reviews.
Reviewed by Dr Vishal Patel · BDS, MSc Aesthetic & Restorative Dentistry · GDC 103127. Last reviewed 5 June 2026.
