According to the website of seeking medical advice, there are two small radians in the corners of your mouth when you smile, which is called the smiling cheek gallery. The smiling cheek gallery refers to the gap between the side of the teeth and the corner of the mouth when people smile. People who smile on their cheeks will look better when they smile. Under the traditional aesthetics, smiling in a small space will make the smile fuller and the mood more natural, so the smile will be more charming.
Smile is a common facial expression, which shows that the muscles of the upper lip contract slightly, making the corners of the mouth rise and the eyes keep closed. In addition to expressing emotions, smiling can also enhance interpersonal attraction and reduce stress.