The white material in the cavity after wisdom teeth extraction is considered to be food debris or normal mucous membrane covering the wound. 1. Food debris: after wisdom teeth extraction, there will be a wound, when eating rice or other food debris will enter the hole, there are white objects in the hole, this does not require special treatment, rinse out after meals can be rinsed out. 2. Covered in the cavity of the normal mucous membrane: after wisdom teeth extraction wound will slowly recover, the oral epithelium gradually grows to the wound, due to the presence of saliva in the oral cavity presents a moist environment, the newly formed mucous membrane is white, is a normal wound healing process, do not need to deal with, to avoid local stimulation normal brushing and rinsing to prevent infection. After the extraction of wisdom teeth, such as the emergence of abnormalities, it is recommended to consult a doctor in a timely manner, under the guidance of the doctor for examination and treatment to avoid blind disposal, in order to avoid adverse consequences.