Smiling is good for you!
It is believed that the Duchenne smile (named after the French researcher Guillaume Duchenne) is the only form of what one could call the “genuine” smile. It is achieved when your curl your upper lip inward and smile with your mouth as much as with your eyes.
The “Pan American smile,” on the other hand is the smile expressed to show politeness, for example by a flight attendant on the former airline with the same name. It only involves the muscles of the mouth and not the eyes.
If you don’t think the Duchenne Smile can change your mood
Try the following facial expressions and see how they make you feel