Upper lip valgus means that the outer side of the upper lip turns upward, usually exposing a part of the upper teeth. This expression is usually regarded as a sign of happiness or enthusiasm, and sometimes it can be used to express surprise or ridicule. In some cultural backgrounds, this expression may not be considered polite or appropriate, so pay attention to the occasion.

Upper lip valgus is a kind of facial expression, which is related to people's emotional state and personality characteristics. Some cheerful, lively and sociable people often show such facial expressions. On the contrary, some shy and introverted people can't show such an expression. In addition, some people naturally raise their lips, which makes it easier to show this expression.

Upper lip valgus is a common facial expression, which is often used in daily life. Especially in interpersonal communication, this expression can effectively convey emotions and exchange information. In business negotiations, speeches, interviews and other non-daily social occasions, the use of this expression needs to be cautious to avoid leaving an inappropriate impression.