Mewing takes months to years to produce noticeable changes in adults, and results are not guaranteed. For children and teenagers whose bones are still growing, some proponents claim changes can appear in weeks. But before you commit to a timeline, it’s worth understanding what the evidence actually says about whether mewing works at all.
What Proponents Claim About Timelines
In mewing communities, the general expectation breaks down by age. Teenagers and young adults under 20 or so are told they might see subtle changes within a few months, since their facial bones haven’t fully fused. Adults in their 20s and 30s are typically told to expect 6 months to 2 years for visible results. Adults over 40 are warned it could take even longer, if changes happen at all.
The reasoning behind these estimates is that younger bone is more responsive to pressure. Children’s skulls are still developing, with growth plates and sutures that allow for reshaping. By your mid-20s, the midface has largely solidified, and any remodeling from light tongue pressure would be extremely slow. Age is the single biggest factor people point to when explaining why some claim faster results than others.
What the Evidence Actually Shows
Here’s the uncomfortable truth: there is no clinical research demonstrating that mewing reshapes the jaw or facial structure. The Cleveland Clinic states plainly that mewing “isn’t specific or strong enough to significantly change dental or facial features.” The American Association of Orthodontists puts it even more bluntly, noting that scientific evidence supporting mewing’s jawline-sculpting claims is “as thin as dental floss.”
Facial structure is shaped by a complex interaction of genetics, bone growth, and muscle development. Simply changing where your tongue rests isn’t enough to override those forces. Orthodontic appliances work because they apply carefully calibrated, consistent pressure following specific biological principles. Your tongue, resting against your palate, doesn’t generate that kind of targeted force.
This doesn’t mean people who practice mewing never notice changes in their appearance. But those changes likely come from other factors: losing body fat (which sharpens the jawline dramatically), natural aging and facial maturation, improved posture, or simply paying more attention to how they hold their head and neck.
Soft Tissue Changes vs. Bone Changes
One reason the timeline question is so confusing is that people conflate two very different things. Soft tissue changes, like a slightly more defined jawline from improved posture or reduced facial puffiness, can happen relatively quickly. If you start holding your head upright instead of jutting your chin forward, your neck and jaw will look different within days. That’s posture, not bone remodeling.
Actual skeletal changes, like widening the palate or moving the upper jaw forward, require forces that mewing doesn’t deliver. When orthodontists need to expand a palate, they use mechanical devices that apply measurable, sustained pressure over weeks or months under clinical supervision. The tongue simply can’t replicate that.
The Daily Practice Expectation
Mewing advocates recommend working up to holding proper tongue posture throughout the entire day. WebMD describes the technique as starting with 10 to 20 seconds at a time, repeating several times daily, and gradually increasing until you can maintain the position comfortably all day long. The goal is for it to become your default resting tongue position, even during sleep.
This is actually close to where many people’s tongues naturally rest. If your tongue already sits against your palate when your mouth is closed, you’re essentially already “mewing.” The technique is really about correcting a low tongue posture, where the tongue rests on the floor of the mouth, which some practitioners associate with mouth breathing and poor facial development in childhood.
Factors That Supposedly Speed Up Results
Within mewing communities, several variables are cited as influencing how quickly you’ll see changes:
- Age: Younger practitioners with developing bones report faster changes.
- Consistency: Maintaining tongue posture all day, every day, rather than practicing for a few minutes here and there.
- Starting point: Someone with a significantly recessed jaw has more room for potential change, but also a harder starting position.
- Body fat: Losing facial fat makes any underlying structural changes (or the illusion of them) far more visible.
- Genetics: Some people’s bone structure is simply more responsive, or their genetics already favor the defined facial features they’re chasing.
These factors are largely anecdotal. Without controlled studies, it’s impossible to separate what mewing itself contributes from what weight loss, aging, posture correction, and puberty are doing independently.
What Actually Works for Jaw and Facial Changes
If you’re genuinely concerned about your jaw alignment, bite, or facial structure, an orthodontist can offer treatments backed by decades of clinical evidence. Palatal expanders can widen a narrow upper jaw, particularly in younger patients. Orthognathic surgery can reposition the jaw in adults. Orthodontic appliances can shift teeth and influence jaw position using precise, sustained force that follows well-understood biological pathways.
Mewing is unlikely to cause harm for most people. Resting your tongue on the roof of your mouth and breathing through your nose are generally fine habits. But setting a timeline for “mewing results” implies a certainty about outcomes that the current evidence simply doesn’t support. If you’ve been mewing for months without changes, that’s not necessarily a sign you need more time. It may be a sign that the technique can’t deliver what you’re hoping for.