zAbnormal muscle habits like Mentalis Habit - muscle arises from the mandible near the apices of the incisors
and inserted into the soft tissue of the chin, puckering
the skin and the lower lip is folded behind the
maxillary incisors with the inner surface of
the lip elevated upwards.
zPlacing the lower lip between the maxillary and mandibular incisors.
zFrequently arises following development of anterior open bite.
zCan be accompanied by skeletal Class I and II relationships.
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