Mewing: What the Science Actually Says About Tongue Posture and Your Jawline

The Claim That Jawlines Can Be Reshaped With Your Tongue

Videos have amassed billions of views. Forums are full of before-and-after photos. Online coaches sell courses and pose for transformation selfies. The idea, known as "mewing," promises that placing your tongue against the roof of your mouth can reshape your jawline, define your cheekbones, and transform your face , all without surgery.

The science, however, tells a different story.

Mewing is named after British orthodontist John Mew, who developed the technique as part of a practice he called "orthotropics" [1]. The idea is that sustained tongue pressure against the palate can influence how facial bones grow and develop. John Mew's son, Mike Mew, became the public face of the movement, producing videos and accumulating a following that translated into massive social media reach [5].

But in November 2024, Mike Mew was erased from the UK dental register by the General Dental Council after a seven-year investigation [5]. The council found he posed a "risk to public safety," undertaking treatments "with no objective evidence base" [5]. A six-year-old patient treated by Mew suffered seizure-like episodes when pushed to wear prescribed head and neck gear. The treatment cost the family £12,500 over three years [5].

That disciplinary outcome matters. It reflects a pattern of concerns that extend beyond one practitioner.

Why the Biology Doesn't Add Up

The facial skeleton finishes growing in the late teens. By your mid-20s, the maxilla and mandible are largely fused and resistant to the kind of remodeling that mewing proponents claim [4]. The bones simply do not respond to the modest forces that tongue posture generates.

This is not a contested point in bone biology. Wolff's law , the principle that bone adapts to mechanical load , is well-established. But the question is magnitude. Orthodontic appliances apply controlled forces of 40 to 50 grams per tooth over sustained periods [4]. Tongue pressure from mewing delivers roughly 1 to 2 grams per tooth [4]. That is not a rounding error. That is an order of magnitude difference.

When orthodontists use braces or aligners to move teeth, they apply forces that trigger predictable bone remodeling in the surrounding tissue [6]. The process is slow, targeted, and clinically monitored. Mewing applies diffuse, low-level pressure that cannot achieve comparable mechanical effect on adult bone [3].

A 2019 editorial in the Journal of Oral and Maxillofacial Surgery concluded there is no scientific support for the orthotropic claim that tongue posture can re-route facial growth [1]. The American Association of Orthodontists and the British Orthodontic Society independently confirm this [4]. No peer-reviewed randomized controlled trial has ever demonstrated that mewing produces statistically significant changes in adult facial bone structure [3].

The Before-and-After Problem

The mewing community relies heavily on photographic evidence. Side-by-side comparisons allegedly show jawline improvements after months of consistent tongue posture.

There is a straightforward explanation for most of these images. Lighting changes. Angles shift. Body fat fluctuates. Facial hair appears or disappears. People age, sometimes dramatically, during the periods being compared [4]. Adolescents who mew may simply be experiencing normal facial maturation that would have occurred regardless.

One systematic review of myofunctional therapy , the legitimate clinical practice that mewing loosely references , notes that the leap from "therapy improves oral function" to "mewing will restructure an adult face" is not fully supported by current evidence [3].

What Orthodontists Actually See

The American Association of Orthodontists has addressed mewing directly. Their position is that facial restructuring involves moving jaw bones and soft tissue through processes that tongue posture alone cannot achieve [2]. Simply changing tongue placement is not enough to correct misaligned teeth, reshape a jawline, or prevent the need for orthodontic treatment.

There are also risks. Excessive or uneven tongue pressure can disrupt natural tooth alignment, contributing to malocclusion [2]. Improper pressure can cause underbites, overbites, open bites, and gaps between teeth [2]. TMJ pain is a documented complication from excessive jaw clenching that sometimes accompanies mewing attempts [4]. Speech difficulties can result from altered oral mechanics [2].

The AAO recommends against attempting to move teeth or align jaws without appropriate professional supervision [2]. Trained orthodontists can evaluate tongue resting position and coordinate with other specialists to guide oral posture in a more favorable direction , when that guidance is clinically indicated.

The Legitimate Science Underneath

There is a real phenomenon here, just not the one being sold online.

Nasal breathing is superior to mouth breathing. Switching from chronic mouth breathing to nasal breathing carries genuine health benefits, including reduced facial puffiness and better head and neck posture [3]. These effects are measurable and well-documented.

Myofunctional therapy is a legitimate clinical treatment delivered by trained speech and language therapists or specialist dentists for specific problems: tongue thrust, swallowing dysfunction, and selected cases of obstructive sleep apnoea [4]. This therapy has an evidence base. It addresses diagnosed conditions, not aesthetic goals.

What mewing attempts to do is take legitimate observations about oral posture during childhood development and extrapolate them into a DIY regimen for adults seeking bone-level facial transformation. That extrapolation is not supported by the evidence.

The people most likely to see structural results from tongue posture are children and adolescents whose facial bones are still growing [3]. For adults, the realistic expectation is better breathing, improved posture, and potentially modest changes in how the jawline appears due to soft tissue and muscle positioning , not bone remodeling.

If you are an adult considering mewing, the honest version of the pitch is: maintain good tongue posture for better breathing and oral health, with the understanding that the dramatic jawline transformation you see in social media posts is not coming from your tongue alone.