Typically, one that people don't consciously control that muscle, so if it contracts, it indicates true happiness (unlike a fake, forced smile). ![]() ![]() This contraction causes tiny wrinkles at the corner of the eyes known as crow's feet to form. When a person smiles sincerely (because they're feeling true joy), it causes a small muscle in their upper face to contract. And when any girl is flirting, she'll probably be flashing the incredibly sincere "enjoyment smile." According to a study by Paul Ekman, there are 18 different types of smiles.
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