Can u distinguish between a fake smile and a real smile. Its easy.
A real smile appears primarily because of the action of two muscles:
the zygomaticus major, which stretches from the corner of the mouth to
the cheekbone, and the orbicularis oculi, which surrounds the eye. When
working together bilaterally, these draw the corners of the mouth up and
crinkle the outer edges of the eyes, causing the crow’s feet of a familiar
warm and honest smile.
On the other hand When we exhibit a social or false smile, the lip corner stretches sideways through the use of a muscle called the risorius.
(Information taken from book "What every Body is saying" by Joe Navarro, page number 186)
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