Laugh lines, sometimes called smile lines, are wrinkles or creases in the skin of a person’s face that appear around the outer corners of the mouth and eyes. Various exercises may help a person ...

the mouth's and the eyes' width, and many others. 'Smiling can make it harder [to recognise a person], as it alters facial proportions.' That's why people are asked to keep a 'neutral ...

which lifts the corners of the mouth. But a Duchenne smile is characterised by the additional contraction of the orbicularis oculi, crumpling the skin around the eyes into crows’ feet.