Front. Public Health · 2024
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Mouth breathing flattens the jaw.
A 2024 review of craniofacial studies found that chronic mouth breathers develop longer faces and weaker, flatter jawlines than nasal breathers, because the open-mouth posture pulls the face down over time. Nasal breathing supports the lips-sealed, tongue-up posture behind a defined jaw.
Want the jawline? It starts with how you breathe. Mouth shut, tongue up.
Mouth breathing & craniofacial development. Front. Public Health, 2024.Developmental evidence; supports oral posture, not adult bone change.
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