A white mass growing in the wound after tooth extraction may be caused by food attachment, unrecovered gum tissue, oral ulcers and other factors. 1. Food adhesion: not cleaning the mouth in time after eating may cause food debris to adhere to the gums around, resulting in the appearance of white material in the wound after tooth extraction. 2. Gum tissue not recovered: after tooth extraction, the gum tissue in the affected area is still in the recovery stage, and white changes may appear during the growth process. 3. Mouth ulcers: the disease is related to genetics, diet, immunity and other factors, the immunity will be reduced after tooth extraction, the gum tissue at the wound is prone to mouth ulcers, white-like lesions appear in the affected area. After the extraction of the wound grew a mass of white things can go to the hospital, identify the cause of the relevant treatment.