a) Inability of the Lips to cover the incisors in the mandibular relaxed position
b) Inability of the lips to cover the incisors in occlusion
c) The lips come in between the upper and lower incisors
d) Tongue thrusts against the lips during swallowing
The correct answer is A. Inability of the Lips to cover the incisors in the mandibular relaxed position
Competent Lips : The lips are in slight contact when the musculature is relaxed
Incompetent Lips : Morphologically short Lips which do not form a lip seal in relaxed state
Potentially competent lips: Normal lips that fail to form a lip seal due to proclined upper incisors or increased facial height
Everted Lips: Hypertrophied lips with weak muscular tonicity
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