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Mewing is a technique developed by Dr.John Mew, a British orthodontist, which involves proper tongue posture to supposedly improve facial structure, including the jawline. The idea is that by maintaining proper tongue posture against the roof of the mouth, you can encourage forward growth of the maxilla (upper jaw) and potentially improve facial appearance.

While some proponents claim that mewing can reshape the jaw and improve facial aesthetics, there is limited scientific evidence to sup port these claims. The concept is based on the theory of orthotropics, which suggests that improper oral posture can lead to malocclusion (misalignment of teeth and jaws) and other facial asymmetries.

However, the effectiveness of mewing in reshaping the jaw is controversial and not widely accepted within the mainstream medical and dental communities. Skeletal changes to the jaw typically occur during childhood and adolescence when bones are still growing and developing. After this period, it becomes more challenging to induce significant changes to the skeletal structure without orthodontic intervention such as braces or surgery.

While maintaining proper tongue posture may have some benefits for oral health, including improving swallowing and preventing issues like tongue thrust, it's unlikely to dramatically reshape the jawline in adults. If someone is concerned about their jawline or facial appearance, they should consult with a qualified orthodontist or maxillofacial surgeon who can provide evidence-based treatment options tailored to their specific needs.