Mewing is a form of oral posture training aimed at improving jaw and facial structure, and today part of looksmaxxing practices, notably applied by some involuntary celibate men.
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The technique was named after the British orthodontist John Mew, who developed it as a part of a practice he called Orthotropics. However, mind that mewing is not scientifically supported and not considered effective by the orthodontic world.
The mewing technique involves continuously placing the tip of one’s tongue (and in a more advanced state: the entire tongue) against the roof of the mouth (the palate) just behind the upper front teeth and applying pressure, which would modify the structure of the jaws by pushing the upper jawbone (the maxilla) forward and upwards.
Some “mewers” recommend using a suction technique by gathering saliva and swallowing it, which creates a vacuum that holds the tongue in the right place. It’s thought to be more effective than just pushing.
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Other important recommendations are to breathe nasally, not through the mouth. Initially the tongue posture should be held for only short periods (up to 30 seconds) while gradually increasing the duration until it becomes your natural resting tongue posture.
There are obvious similarities with the facepulling looksmaxxing technique, and mewing and facepulling are often applied in conjunction.
The final goal of both techniques is to enhance facial aesthetics, jawline definition (by creating a more chiseled appearance), and breathing by expanding the palate over time.
