The nasolabial folds, commonly known as " smile lines" or " laugh lines", are . They are the two that run from each side of the nose to the corners of the mouth. They are defined by facial structures that support the buccal fat pad. They separate the from the upper lip. The term derives from Latin language nasus for "nose" and labium for "lip". Other people suggest the term melolabial fold, Why Do Nasolabial Folds Appear? Exploring the Anatomical Perspectives and the Role of Thread-Based Interventions, or the lip-cheek fold or groove. The Lip-Cheek Groove: A New Analysis With Treatment Options, It is also known as the nasolabial sulcus.
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