This is the "gold standard" of authentic enjoyment, characterized by the engagement of muscles around the mouth and the eyes (causing crinkling or crow's feet).
Smiling triggers chemical reactions that boost your well-being. What's the science behind a smile? - British Council
Researchers have identified up to 19 different types of smiles, though they generally fall into three categories: reward, affiliation, and dominance.
A smile is a universal, instinctual human expression used to show joy, connection, friendliness, or even comfort in difficult situations. While often deemed a simple gesture, it is a complex, 43-muscle action that serves as a powerful nonverbal communication tool.
