6 min read • By Dr. Kevin Baharvand, Diplomate, American Board of Orthodontics • Trends & Culture

Mewing comes up in my chair almost every week now, usually from a teenager who saw it on TikTok and wants to know if resting their tongue a certain way will hand them a sharper jawline. It has become one of the most searched dental trends of the last few years, and also one of the most misunderstood. So here is the honest orthodontist’s version: what mewing actually is, what the science supports, and where the hype quietly turns into wishful thinking.

What mewing actually is

Mewing is the practice of resting your tongue flat against the roof of your mouth, keeping your lips together and your teeth lightly touching, and breathing through your nose. The claim is that holding this posture consistently, for months or years, gradually reshapes the jaw and sharpens the facial profile. At its core, mewing is a posture habit, not a procedure and not a treatment. That distinction is where most of the confusion begins, because a habit and a treatment are very different things with very different results.

Where mewing came from

The technique is named after Dr. John Mew, a British orthodontist who developed a philosophy he called orthotropics, and his son Dr. Mike Mew, who brought it to a huge online audience. Their central idea is that tongue position and overall facial posture influence how the jaws grow. That underlying concept is not fringe on its own. Orthodontists have long recognized that oral habits and breathing patterns affect development in growing children. What is genuinely disputed is how far you can stretch that idea, and whether a posture habit by itself can stand in for real treatment.

Does mewing actually work?

Here is the nuance the viral videos skip. In children and young teens, whose facial bones are still growing, tongue posture and breathing patterns really do influence development. That is part of why we screen for mouth breathing and airway problems early. In adults, growth is finished. The bones of the face have fused, and no amount of tongue pressure remodels a mature jaw. The American Association of Orthodontists puts it plainly: there is no solid evidence that mewing changes bone structure, and pushing it too hard can cause harm, including unwanted tooth movement and strain on the jaw joints. So the honest answer is mildly relevant for a growing child’s habits, and essentially cosmetic theater for a grown adult’s bone structure.

Mewing before-and-afters: fact or fiction

Search “mewing before and after” and you will find dramatic side-by-side photos. Treat them with heavy skepticism. Most are explained by things that have nothing to do with tongue posture: losing facial fat as someone slims down, a change in camera angle or lighting, straighter neck and shoulder posture in the second shot, or simply flexing the jaw muscles for the photo. In some cases the “after” is the result of real orthodontic treatment or even jaw surgery the poster never mentions. A photo is not evidence, and social media is full of confidently captioned ones.

What mewing can and cannot do

It helps to separate the modest, honest benefits from the things it simply cannot deliver. On the realistic side, mewing can:

• Encourage better tongue resting posture and nasal breathing, both healthy habits
• Build awareness of how you hold your jaw, mouth, and head

What it cannot do is the part people most want to believe:

• Correct an overbite, underbite, or crossbite
• Widen a narrow palate or resolve crowding
• Change bone structure in an adult
• Replace braces, aligners, or a palate expander when you genuinely need one

Where it connects to real care: your airway

The one legitimate thread in the whole mewing conversation is breathing. Chronic mouth breathing and a narrow palate genuinely affect how a child’s face and bite develop, and unlike mewing, those are things we can actually treat. That is the idea behind our airway orthodontics program. Instead of hoping tongue posture fixes things over years, we evaluate how a child breathes and sleeps and, when it is warranted, use real tools like a palate expander to create room and support healthy development. That is the difference between a habit you read about online and a plan built on an actual exam and records.

The viral side: looksmaxxing, memes, and the risky corners

Mewing did not stay a standalone tip. It got absorbed into the broader “looksmaxxing” movement and a wave of memes and challenges, and that is where it becomes worth watching for parents. Alongside the harmless tongue-posture advice, that ecosystem promotes some genuinely bad ideas: DIY jaw-training devices, chewing hard objects for hours to “build” the jaw, and even “bone smashing,” the alarming practice of striking the face in the belief it thickens bone. None of that is safe, and some of it causes real injury to teeth and joints. The tongue-posture piece is fine. The company it keeps online is not always, so if your teen is deep in that content, it is worth a calm conversation.

So should you try mewing?

If you are an adult hoping mewing will reshape your jaw, I would gently reset expectations, because it will not. If you simply want to breathe through your nose and rest your tongue on the roof of your mouth because those are good habits, there is no harm in it and I would encourage it. And if you are a parent who notices your child mouth breathing, snoring, or dealing with crowding, please do not lean on a TikTok habit to fix it. Those are exactly the issues a proper evaluation can catch early, while they are still easy to guide.

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