Lookmaxxing's Favourite Trick Under The Microscope: Does Mewing Change Your Face?

From a medical standpoint, mewing is simply a tongue posture habit.

"It involves placing your entire tongue against the roof of your mouth, keeping your lips together and breathing through your nose," explains Heba Ali. "It's not a medical treatment or procedure, and it's not something that's taught as part of the dental curriculum."

The concept was originally proposed by orthodontist Dr. John Mew, who believed proper tongue posture during childhood could influence facial growth. While that discussion has relevance in growing children, Heba says the same logic doesn't apply to adults whose facial bones have already finished developing.

That's an important distinction because much of the online conversation fails to separate growing children from fully grown adults. During childhood and adolescence, the facial bones are still developing, meaning certain oral habits can influence growth. Once skeletal growth is complete, however, those bones don't remodel simply because tongue posture changes.

This is where social media and science begin to part ways.

According to Heba, there is currently no high-quality scientific evidence showing that mewing can reshape an adult's facial bones or permanently create a sharper jawline.

"There are no robust studies proving that mewing changes adult facial structure," she says. "Most of the dramatic transformations people see online are explained by better lighting, different camera angles, changes in body fat or simply natural growth if the person is still a teenager."

"In many cases, the difference comes down to head position or camera focal length. It's not bone changing. It's photography."

Weight loss can also play a significant role in making the jawline appear more defined. As body fat decreases, facial contours naturally become more visible, which is why many viral transformations may have very little to do with mewing itself. Without knowing everything that happened behind a mewing before and after the photo, it's impossible to credit tongue posture alone for the change.

One of the biggest misconceptions surrounding looksmaxing is the belief that facial structure can be completely reshaped through habits alone.

Heba estimates that around 70% to 80% of our facial skeleton is determined by genetics. Environmental factors certainly play a role during childhood. Chronic mouth breathing, thumb sucking and poor tongue posture can influence how the face develops while bones are still growing.

However, once adulthood is reached, that growth window closes.

"The blueprint is already built," she explains. "No amount of pressing your tongue against your palate is going to override your genetic bone structure."

Although mewing benefits are often exaggerated online, maintaining proper tongue posture and breathing through your nose can still be positive habits.

Good oral posture may encourage better nasal breathing and increase awareness of jaw tension or mouth breathing habits. However, these shouldn't be confused with permanent structural changes to your face.

Heba stresses that people should separate healthy oral habits from unrealistic cosmetic expectations.

Not necessarily.

According to Heba, people with temporomandibular joint (TMJ) disorders, jaw pain, clicking or locking should avoid forcefully practising the mewing exercise, as it may place additional strain on already irritated muscles.

She also advises caution if you're currently undergoing orthodontic treatment with braces or clear aligners. Any changes to tongue posture should first be discussed with your orthodontist.

Perhaps most importantly, she encourages people to pay attention to their relationship with appearance.

"If you're constantly analysing your side profile or checking your reflection for tiny changes, it may be healthier to step away from the trend altogether," she says. "It can create anxiety over a problem that isn't actually there."

Social media thrives on dramatic transformations, and looksmaxing content often presents mewing before and after images without the full story.

According to Heba, many viral transformations fail to mention other factors that significantly affect facial definition, such as orthodontic treatment, cosmetic procedures or substantial weight loss.

"Young people are being led to believe they can completely rebuild their face at home," she says. "I'm seeing more patients who feel disappointed because they've spent years mewing without seeing the results they were promised."

She believes that sense of failure stems from unrealistic expectations rather than a lack of effort.

If you're an adult hoping to permanently reshape your jawline, the evidence says no.

According to Heba, mewing won't alter your facial bones after they've finished growing. At most, it may subtly change tongue position or the appearance of the skin beneath your chin in certain photographs, but that's very different from creating a new jawline.

"If someone wants genuine structural change, the evidence-based options are orthodontics, jaw surgery or, in selected cases, cosmetic fillers," she says. "Anyone promising otherwise is selling a fantasy, not dentistry."

That doesn't mean good oral posture is a bad habit. But if you're expecting mewing to deliver dramatic facial changes, it's worth remembering that viral trends don't always reflect biological reality.