The chin is as important as human eyes and nose. When the chin is covered and exposed, there will be two different faces. Short chin includes retraction and excessive protrusion. Retraction can be achieved by osteotomy and prosthesis filling, which includes the following methods: 1, injection of hyaluronic acid: it is a temporary improvement and needs to be repeated once every six months; 2. Silicone prosthesis: it is a permanent prosthesis with high safety and has a history of hundreds of years; The disadvantage is that there are no pores, just wrapped, and there may be some displacement in the later stage; 3. PTFE: a permanent prosthesis filled with porous materials, in which tissues can grow.