The smile, one of the most beautiful expressions

The smile, one of the most beautiful expressions that appear on the face, and in the form of a breakthrough formed on the sides of the mouth, and are usually used to express a form of joy and happiness and pleasure, or feeling of pleasure, or exclamation, but sometimes it is just a feeling of reluctance, . The smile is a natural reaction to a particular stimulant that is joyful, and the motivations that call for the smile vary according to the different environments, cultures and societies. The smile is one of the reasons for logical and mental thinking.