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Smile lines often form over time due to “repeated folding of the skin on the side of the mouth from smiling and facial movement,” says Joshua Zeichner, M.D., director of cosmetic and clinical ...
The nasolabial folds, commonly known as "smile lines" [1] or "laugh lines", [2] [self-published source] are facial features. They are the two skin folds 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. [3] They separate the cheeks from the upper lip.
The transverse nasal crease or groove is a usually white line between the upper two-thirds and the lower third of the human nose (slightly above the cartilage tip between the bridge and nostrils). It can occur as the result of heredity, accident, or the constant rubbing or wiping of the nose, commonly referred to as the allergic salute .
Dogs smile by pulling one or both lips back and may show all or some teeth. The "smiling" is often accompanied by other greeting behavior s, like approaching, wagging or even whining.
It is difficult to determine exactly how many muscles are involved in smiling or frowning as there is a wide range of facial expressions that might be considered a frown or a smile. At minimum ten muscles are required to smile in which only the upper lip and corners of the mouth are lifted. [ 17 ]
Marionette lines appear with advancing age, but some people never get them, depending on facial structure and anatomy. They tend to appear as the ligaments around the mouth and chin relax and begin to loosen and sag, and fatty tissues of the cheek deflate and descend during the aging process.
A less dominant dog approaching a dominant dog with its head down, and only on occasion quickly pointing its muzzle towards the higher-status dog – shows no fight is intended. [ 1 ] : 120 In an alternative interpretation that does not involve dominance and submission, turning the head away is recognized as a calming signal.
[172] [173] Natural gas expanded under Trump, but coal continued to decline. [ 174 ] [ 175 ] He rolled back more than 100 federal environmental regulations, including those that curbed greenhouse gas emissions , air and water pollution, and the use of toxic substances.