What Is Mewing?

Who Is Dr. John Mew?

Dr. John Mew is a British orthodontist who developed "orthotropics," a controversial approach to facial development. He and his son, Dr. Mike Mew, argue that modern soft diets and mouth breathing have led to underdeveloped jaws. Their theory suggests that proper tongue posture can guide facial bone development, particularly in younger individuals whose bones are still growing. While the ideas have a dedicated following, they remain outside mainstream orthodontic practice.

How to Mew Correctly

The basic technique involves resting the entire tongue (not just the tip) flat against the roof of your mouth, with lips gently closed and teeth lightly touching or slightly apart. Breathing should be through the nose. The tongue should press evenly across the palate, with the back third engaged -- the part most people struggle with. Advocates recommend maintaining this posture throughout the day until it becomes natural.

Claimed Benefits

Proponents claim benefits including a more defined jawline, wider palate, improved facial symmetry, better breathing, and a more forward facial profile. Before-and-after photos circulate widely on social media, though these are often taken at different angles, lighting conditions, or after significant time periods where natural aging and other changes may be factors.

What Does the Science Say?

Scientific evidence for mewing in adults is very limited. While proper tongue posture and nasal breathing are generally good habits, no peer-reviewed research proves mewing can reshape adult facial bones. Facial bones are largely set by the late teens. Some orthodontists acknowledge tongue posture may play a role in childhood development but are skeptical about adult claims. Mewing is unlikely to cause harm, but expectations should be realistic.

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