lip retraction

lip re·trac·tion

(lip rĕ-trak'shŭn)
An atypical oral pattern that occurs when the lips are drawn back to form a tight horizontal line over the mouth, making it difficult to assist with sucking liquids, removing food from a spoon or cup, and retaining food in the mouth.
Medical Dictionary for the Health Professions and Nursing © Farlex 2012
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Some authors use a different label for a similarly categorized subtype, lip licking cheilitis, due to lip licking habit or frequent lip retraction into the oral cavity (especially in children with atopic dermatitis) (6,7).
However, other soft tissue measurements such as z-angle and s-line41 can be used to confirm lip retraction and lower facial profile changes following 1st premolar extraction.