A smile is formed primarily by flexing the muscles at the sides of the mouth. See more

A smile is a facial expression formed primarily by flexing the muscles at the sides of the mouth. It is believed it takes about 42 muscles to smile. See more

Happiness is a mental or emotional state of well-being which can be defined by, among others, positive or pleasant emotions ranging from contentmen... See more

A face with a big open (grinning) mouth, showing teeth. See more

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A smile is the best perk for the day and the easiest way to spread. See more

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