How smile comes on face? is there any harmones to control this?

__How smile comes on face? is there any harmones to control this?
It's not really controlled by any hormones it is just a relaxation of your facial mussels. When you are concentrating (thinking or typing for instance) the mussels tighten slightly so you frown. When you are totally relaxed the mussels relax and you smile. When you smile or frown at will it is because you are tightening or loosening the mussels by your own choice. So relax and lets have a smile!How smile comes on face? is there any harmones to control this?
A human smile is shown in research to be a universal human trait. In other words, a social smile in any culture or geographic region of the world carries the same meaning. Thus, science considers the social smile to be an innate human trait, which is based in our biological makeup.
a smile is a facial expression formed by flexing muscles most notably near both ends of the mouth, but also around the eyes. Among humans, it is customarily an expression of pleasure or amusement,








produce endorphins which reduce physical and emotional pain, and give a greater sense of well-being
It is an uncontrollable reflex reaction by the brain. No hormones involved in the making of your smile. Just your tiny weeny brain. You smile when you are happy and not when you are provoked.


Duh!