* Simply place two fingers on each corner of your mouth and try to smile against the resistance they create. * Hold each ...

Smile lines, commonly known as laugh lines or nasolabial folds, refer to the deep creasing of the skin around the mouth. Typically, these lines appear on both sides of the mouth when you smile ...

There is a distinctive and easily recognized open-mouth expression that is the canine equivalent of a human smile, ...

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All smiling involves contraction of the zygomatic major muscles, which lifts the corners of the mouth. But a Duchenne smile is characterised by the additional contraction of the orbicularis oculi ...