The third day of tooth extraction fell off a piece of rotten meat under normal circumstances may be residual granulation tissue or residual marginal gingival detachment, usually not accompanied by other symptoms, disease conditions may have occurred in the infection, usually accompanied by pain and swelling. 1. Normal condition: (1) Residual granulation tissue: residual granulation tissue sometimes exists in the extraction socket after tooth extraction. If the scraping is not clean, the residual granulation tissue may be shed as the extraction wound heals. (2) Remnant marginal gingiva: the gingiva may be torn during tooth extraction, and the torn marginal gingiva may become necrotic if it is not repaired, and then fall off after chewing and friction. 2. In case of disease: the residual granulation tissue may cause chronic infection of the wound, which can be seen as poor wound healing, congestion and edema, and pain. If the above symptoms occur, it is recommended to go to the hospital in time to receive regular treatment.