First, the indications of rhinoplasty are not properly grasped: if the complex saddle nose is only used for simple rhinoplasty, it will not have satisfactory results.

Second, improper material selection: exclusion or exclusion often occurs, and it really can't achieve the effect of completely correcting the nose shape.

Third, insufficient preoperative preparation: such as improper trimming of nose hair, insufficient disinfection of nose and materials or overdue infection.

4. Improper material dressing: the nose shape is too long, too short, too high, too low, irregular, or the tunnel at the back of the nose is too shallow, incorrect, layered or improperly cut, which may easily lead to bad nose shape or infection.

5. Poor postoperative cooperation, irregular filling of materials during operation: it is also easy to cause poor nose shape, and improper postoperative treatment or repeated surgery in a short time often leads to adverse consequences.