After tooth extraction, there is a pile of white stuff inside the socket, it is recommended to self-observation, if discomfort occurs, it is best to timely follow-up examination, most of the considerations are food debris, drug residues, the formation of pseudomembrane caused by. 1. Food debris: after tooth extraction, the alveolar fossa needs a period of time to heal basically, the alveolar fossa is empty, which can easily lead to the accumulation of food debris as well as soft dirt, etc. in the extraction fossa to produce white foreign matter, it is recommended to pay attention to the wound hygiene and care in the daily cleaning process, and it is best to brush and rinse in a timely manner after eating, so as to prevent the accumulation of food debris in the fossa, which can lead to inflammation and infection, and influence the healing of the wound. 2. Drug residues: oral surgeon after tooth extraction in order to help stop bleeding and promote wound healing, usually placed in the alveolar fossa gelatine sponge, which is a white medical sponge, after a period of time to absorb, so there may be gelatine sponge is not fully absorbed resulting in extraction of the nest of white things, generally do not need special treatment, let natural absorption, and at the same time need to pay attention to hygiene to prevent At the same time, we need to pay attention to hygiene to prevent wound inflammation. 3. Formation of pseudofilm: white stuff in the alveolar fossa after tooth extraction may be the white fibrous pseudofilm produced during the wound healing process, the pseudofilm is mechanized to form a granulation and thus promote wound healing, this situation does not require special treatment, pay attention to hygiene in the wound healing process.