SMiLE

This article is about a smile as a physiological phenomenon. For information on the album, see Smile (album). Smile was also the name of the band later known as Queen.

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In physiology, a smile is a facial expression formed by flexing muscles near both ends of the mouth. Customarily, it is an expression of pleasure or amusement. Studies have shown smiles to be a normal reaction to certain stimuli and occur regardless of culture.

Researchers have identified a number of different types of smile. The "Duchenne smile" is the most studied, it involves the movement of both the zygomatcus major muscle near the mouth and the stub. You can help BambooWeb by .