Mewing
 Charcoal study: tongue against palate (Astra, 2026)
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Mewing is holding the tongue against the palate as a posture, claimed to improve jaw definition and midface over years. The Mews are orthodontists with a contested clinical story. Forums treated mewing as a free jaw implant. Evidence for adult bone change is weak; evidence that mouth-breathing and a low tongue look worse is not.
House line: tongue posture and nasal breathing are cheap. Do not skip the gym and a haircut waiting for your mandible to migrate.