The science behind tongue posture, what orthotropics research shows, and what you can realistically expect from mewing.
Yes, mewing works — but not as a miracle face-reshaping technique. Mewing is effective for improving tongue posture, nasal breathing habits, and oral muscle tone. Visible facial changes depend heavily on age, consistency, genetics, and body fat percentage. The younger you start, the more potential for structural change.
While there are no large-scale randomized controlled trials specifically on "mewing" as a named technique, the underlying principles are well-documented in medical and dental literature:
Research in orthodontics has long established that tongue position affects palatal width and facial growth patterns. Studies show that children with low tongue posture and mouth breathing tend to develop longer, narrower faces (adenoid facies), while those with proper tongue posture develop wider palates and more balanced facial proportions.
Multiple studies confirm that nasal breathing promotes better facial development compared to mouth breathing. Nasal breathing increases nitric oxide levels, supports proper tongue position, and is associated with wider dental arches. This is a core component of how to mew properly.
Orofacial myofunctional therapy (OMT) — essentially guided exercises for the tongue and facial muscles — is an established field with published research. Studies show OMT can improve tongue posture, reduce mouth breathing, and complement orthodontic treatment. Mewing shares many principles with OMT.
Wolff's Law states that bone adapts to the forces placed upon it. The tongue exerts significant force on the palate. While adults have limited bone plasticity, consistent gentle pressure over years can theoretically influence bone — the same principle that makes orthodontic braces work at any age.
Orthotropics is a branch of dentistry founded by Dr. John Mew in the 1960s. While traditional orthodontics focuses on straightening teeth (often with extractions and braces), orthotropics aims to guide facial growth in a forward and outward direction through posture correction and oral habits.
Orthotropics remains controversial within mainstream dentistry. Dr. Mew's membership in the British Orthodontic Society was revoked, and many orthodontists dispute the extent of facial changes possible through posture alone. However, the core ideas about tongue posture and breathing are increasingly accepted.
Online communities (Reddit's r/Mewing, r/Orthotropics, YouTube channels) have amassed thousands of mewing before and after reports. While these are not scientific evidence, patterns emerge:
Greatest potential for facial changes. Bones are actively growing and highly responsive to environmental forces like tongue posture. This is where orthotropics is most effective and least controversial — even mainstream orthodontists agree that early habit correction (nasal breathing, tongue posture) benefits facial development.
Still significant potential. Facial bones are still developing, especially the maxilla. Consistent mewing during teenage years can influence jawline development, palatal width, and overall facial proportions. Many of the most dramatic before and after results come from this age group.
Structural bone changes are limited but not impossible (orthodontic braces work on adults, after all). More realistic expectations include: improved muscle tone giving a more defined jawline, better posture, reduced double chin, and significant breathing improvements. Soft tissue changes can still be visually meaningful.
Mewing works as a posture and breathing improvement technique with potential cosmetic benefits. The scientific foundations (tongue posture influence on facial development, benefits of nasal breathing, myofunctional therapy) are solid. The controversy is about the degree of change possible, not whether tongue posture matters at all.
Our recommendation: Practice proper mewing technique consistently. Expect definite improvements in breathing and posture. View potential facial changes as a bonus, not a guarantee — especially if you're an adult. Combine with mewing exercises and jawline exercises for best results.