Many people don’t realize that there are various health reasons why someone might feel uncomfortable showing their teeth when ...

Why you can’t smile in your passport photo usually hits you at the worst moment. You are already sitting in that stiff chair, lights in your face, and someone suddenly says, “No smile.” It feels odd.

Did Shakespeare get it wrong? Is life's basic question "to smile or not to smile," rather than "to be or not to be"? Pierre Teilhard de Chardin, a French Jesuit, scientist, paleontologist, philosopher ...

A smile typically signifies a positive emotional state—happiness, satisfaction, kindness, and warmth. The benefits of a positive mood, according to researchers, include improved heart health, ...