Mewing is a form of oral posture training purported to improve jaw and facial structure.
[1] It was named after Mike and John Mew, the controversial British orthodontists who created the technique as a part of a practice called "orthotropics".
[2][3] It involves placing one's tongue at the roof of the mouth and applying pressure, with the aim of changing the structure of the jaws.
[2] Many orthodontists believe that mewing lacks evidence as a viable alternative treatment to orthognathic surgery.
[1][6] Mike Mew was expelled from the British Orthodontic Society,[2] who faced a misconduct hearing for posing harm to child patients who underwent his treatments.