What is smile....
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Answer: form one's features into a pleased, kind, or amused expression, typically with the corners of the mouth turned up and the front teeth exposed.
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A smile is formed primarily by flexing the muscles at the sides of the mouth. Some smiles include a contraction of the muscles at the corner of the eyes, an action known as a Duchenne smile. Among humans, a smile expresses pleasure, sociability, happiness, joy or amusement.
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