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: A voluntary smile involving only the zygomatic major muscle (pulling the corners of the mouth). It is often used for politeness or masking true emotions. The Psychological Power

: It is one of the few facial expressions recognized instantly in every culture. ZГўmbet

: Named after neurologist Guillaume Duchenne, this is the genuine smile. It involves the involuntary contraction of the orbicularis oculi muscle (lifting the cheeks and crinkling the eyes). : A voluntary smile involving only the zygomatic

A smile is a natural drug. Activating it triggers a chemical cascade in the brain that drastically alters our mood. ZГўmbet

: Smiling releases dopamine, endorphins, and serotonin.