Ω-shaped chin is not a Han gene. This fossa on the mandible is actually called cleft palate, which is a unique skeletal appearance. This kind of mandible accounts for only 20% in Europe and as little as 0.7% in Asia. There will be dents in the upper jaw. In fact, this situation is called the beauty ditch. It was also turned into an omega chin by others. This situation is actually congenital. Although it can be done according to the method of surgical treatment, it will become more and more ugly if it is not suitable for your face. Omega chin is also called "beauty gap" and "apple chin", and English is generally called "Cleftchin". Visually, there is one more groove in the middle of mandible than ordinary people, and the groove of Isoomega chin is shallow; This groove divides the mandible into two parts, and the prominent one will be Ω. Omega is Omega. People with this chin are cool, handsome and masculine.