Lip incompetence is a condition where the lips cannot come together and form a seal without straining when your jaw is at rest. It might be caused by protrusive upper or lower teeth, facial bone structure, allergies, deviated septum, enlarged tonsils, tongue-tie, tongue thrust habit, neurological problems, or weak muscle tone. Orthodontic treatment can correct this condition. The type of treatment depends on the source of the problem.
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