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Digastric Muscle Transfer
Production of a full smile requires both the elevation of the upper lip and a slight depression of the lower lip. Loss of this downward motion of the lower lip produces an uneven smile and loss of facial harmony.
Lower lip weakness usually results from division of the facial nerve (marginal mandibular branch) during a face lift or cancer surgery. In cases of isolated lower lip weakness one portion of the digastric muscle can be transferred to the lower lip to restore lip depression.