A 15-year-old shows up on your caseload having mewed religiously for eight months because a TikTok video told him it would fix his jawline. His mom wants to know if it worked. He mouth breathes through the entire session, his lips are parted at rest, and he swallows with a visible tongue thrust. Nobody has looked in his mouth.
Or it is a colleague, or a referring dentist, or a parent in your intake call asking some version of the same question: isn’t myofunctional therapy just mewing with a credential attached?
That question deserves a straight answer, because the confusion is real and it is costing kids time. The difference between mewing and myofunctional therapy is not a matter of branding. It is the difference between one posture cue and an entire clinical framework.
Put another way, mewing is one small piece of a much larger puzzle, and it is the piece that gets attention because it is the easiest to demonstrate in a fifteen-second video.
Where mewing actually came from
Mewing is an eponym that takes its name from Dr. John Mew, a British orthodontist who introduced orthotropics in the 1970s and argued that facial growth is guided more by muscle function and oral posture than by genetics alone.
His son, Dr. Mike Mew, took the idea to YouTube in the mid-2010s, and the algorithm did the rest. Mew was later stripped of his dental license by the UK General Dental Council, on grounds of publicly denigrating conventional orthodontic tooth movement, extraction, and orthognathic surgery while promoting his own model of malocclusion (Lee, Graves, and Friedlander, Journal of Oral and Maxillofacial Surgery, 2019). That is a conduct ruling, not a verdict on tongue posture, and the evidence problem stands on its own without it.
The premise itself is not absurd. Orthodontics already accepts that sustained gentle force can influence sutures in a growing skull, which is the entire logic behind palatal expansion. The open question is whether tongue rest posture alone generates enough force to do anything meaningful, and whether any of it applies to a person whose midpalatal suture has already fused. So far, the answer to both is mostly no. What made mewing go viral was never the growth science anyway. It was the promise of a sharper jawline without braces, marketed to teenagers and young adults who are already past the growth window where the theory would have its best shot.
What myofunctional therapy actually is
Break the word apart and it explains itself. Myo means muscle. Functional means how that muscle works. When you look inside a mouth, you are looking at a group of muscles doing something. The tongue is resting somewhere. The lips are either sealed or they are not. The jaw is stable or it is compensating. The tissue has tone, whether that shows up as tension or as sluggish, low-tone movement.
Orofacial myofunctional therapy is the assessment and treatment of those patterns. Orofacial myofunctional disorders, or OMDs, are the diagnoses it addresses. A course of therapy typically covers:
- Resting posture: where the tongue and lips sit when nothing is happening, which is where the person spends most of their day.
- Swallowing: tongue thrust patterns, anterior loss, compensations, and the transition to a mature swallow.
- Chewing and bolus management: rotary chew, lateralization, and how efficiently food is prepared for the swallow.
- Nasal breathing: establishing and maintaining it, and identifying the obstruction preventing it.
- Lip seal and jaw stability: the structural support the tongue needs to function.
- Oral habits: thumb sucking, prolonged pacifier use, nail biting, and other patterns that shape the palate over time.
It is behavior modification and neuromuscular re-education, delivered in a dosed sequence with progression criteria and a plan for carryover. It also runs alongside the rest of the picture: tethered oral tissues, adenoid and tonsil size, allergies, and orthodontic timing. You are not training a posture. You are changing how a system functions, and you are working with the other providers who own the structural pieces you cannot fix with exercise.
The differences, side by side
| Mewing | Myofunctional therapy | |
| What it is | One static tongue posture held against the palate | A clinical framework for assessing and retraining orofacial muscle function |
| Who delivers it | Self-directed, learned from social media | A trained clinician: SLP, OT, dental hygienist, or dentist with myofunctional training |
| Assessment first? | No | Yes, including frenulum, airway, swallow, habits, and structure |
| Scope | Tongue position | Rest posture, swallow, chew, breathe, lip seal, jaw stability, habits |
| Primary goal | Facial aesthetics and jawline definition | Function, and the outcomes that follow from it |
| Referral pathway | None | Coordinated with ENT, orthodontics, dentistry, sleep medicine, and allergy |
| Evidence base | No randomized controlled trials supporting skeletal change | Meta-analyses in peer-reviewed sleep and rehabilitation journals, with acknowledged limits |
What the evidence actually says
The research behind myofunctional therapy
The strongest evidence sits in sleep-disordered breathing. A 2015 meta-analysis by Camacho and colleagues in Sleep found that myofunctional therapy cut the apnea-hypopnea index by roughly 50 percent in adults and 62 percent in children, with snoring and daytime sleepiness improving alongside it. There is further support for myo in correcting tongue thrust and swallowing patterns, and in holding orthodontic results after treatment ends.
Be honest about the limits, because a referring physician will be. Those numbers come from small samples, 120 adults and 25 children, and mostly from pre-post case series rather than randomized trials. A 2020 Cochrane review rated the certainty of the evidence as low, and later work through 2026 has strengthened the picture without solving the problem that every study runs a different protocol. The literature also treats myo as an adjunct rather than a replacement. It does not claim myo substitutes for expansion, adenotonsillectomy, or orthodontics. It claims myo makes those interventions hold.
The research behind mewing
There is not much. No randomized trials show that tongue rest posture alone remodels facial bone. In 2019, Lee, Graves, and Friedlander published a commentary in the Journal of Oral and Maxillofacial Surgery warning that mewing was being marketed as a substitute for orthognathic surgery, and concluding that the public needs to know it is not backed by evidence sound enough to make it an alternative to surgical correction. The American Association of Orthodontists issued a similar warning in 2024, adding that sustained self-directed pressure without assessment has been linked to tooth mobility, bite changes, and dental wear.
The defensible version of the mewing argument is the narrow one: in a growing child, resting tongue posture plausibly influences how the maxilla develops. That is a claim myofunctional therapy has always made, which is why rest posture is one component of therapy rather than the whole of it. The internet version falls apart in promising skeletal change to adults whose sutures fused years ago, with no assessment and nobody checking whether the person can physically get their tongue to the palate. The realistic harm is rarely the posture itself. It is the months or years spent on it instead of getting evaluated.
Why tongue posture alone usually fails
Here is what a clinician sees that a video cannot. Telling someone to hold their tongue on the palate assumes three things are already true, and in the population that shows up for myo, they usually are not.
- They can physically reach the palate. A restricted lingual frenum limits elevation. You can coach rest posture all day and the tissue will not allow it to hold.
- They can breathe through their nose. Tongue-to-palate posture requires a sealed mouth, and a sealed mouth requires a patent nasal airway. Enlarged adenoids, chronic allergic rhinitis, or a deviated septum make the posture physiologically impossible to sustain. The mouth opens because the body needs air, and air wins every time.
- The rest of the pattern is not fighting them. A person can hold a beautiful rest posture and still thrust on every swallow, chew inefficiently, and revert the moment attention shifts. Posture without swallow retraining and habit elimination does not carry over.
Add in the absence of any progression plan, any measurement, or any follow-up, and you have the reason mewing produces so many enthusiastic before-and-after photos and so little documented functional change. Most of what people report from mewing is either improved posture awareness, genuine benefit from breathing through their nose more often, or a change in camera angle.
What to do when a patient asks you about mewing
Do not argue with the trend. Redirect to function, because the fact that someone is asking means they have noticed something real about their own face or their child’s. Your job is to find out what that something is.
Ask these questions before you say anything about mewing at all:
- Are they breathing through the nose during the day, and at night? Any snoring, restless sleep, morning headaches, or open-mouth posture on the pillow?
- Are the lips sealed at rest, or is there strain in the mentalis to close them?
- Where does the tongue rest, and can it actually elevate? Assess the frenulum rather than assuming.
- What does the swallow look like? Any anterior or lateral thrust, anterior loss, or compensatory head movement?
- Is there a habit history: thumb, fingers, pacifier past age three, prolonged bottle or sippy cup use?
- What does the structure tell you? Palatal shape, arch width, crowding, tonsil grade, dental wear, open bite.
Then answer the mewing question directly and without condescension. Something like: tongue-to-palate rest posture is genuinely one of the things we work on, and it is one of about eight. On its own, without addressing why your mouth is open in the first place, it will not do much. Let’s find out what is actually driving this.
From there you are on familiar ground: refer where you need to, treat what is in your scope, and build a plan with real progression criteria. The mewing conversation is not a threat to your practice. It is a patient telling you they are already motivated, which is the hardest part of myo to manufacture.
If you are a parent reading this
Your teenager mewing is not going to hurt them, and it is not going to reshape their face. If they are interested enough to be doing it, that is worth acting on. Ask a myofunctional therapist, an airway-focused dentist, or an ENT to evaluate whether there is an actual functional issue underneath: mouth breathing, a restricted tongue, a tongue thrust swallow, or disrupted sleep. Those are treatable, and treating them tends to produce the changes people are chasing on social media anyway, alongside better sleep and better function.
Where to go deeper
The reason mewing filled a vacuum is that most clinicians were never taught to look at the mouth as a muscle system in the first place. If you are seeing patterns you can name but do not feel equipped to treat, that gap is trainable.
The Myo Method® walks you through the full assessment and treatment framework for orofacial myofunctional disorders: how to evaluate rest posture and swallowing, how to sequence therapy, when to refer out, and how to work with the dentists, orthodontists, and ENTs who own the structural pieces. It is the difference between knowing that mewing is not the answer and knowing exactly what to do instead.
