The odor that appears two days after tooth extraction and gelatin sponge filling may be the result of poor maintenance of oral hygiene or infection, etc. The corresponding treatment method is to clean the oral cavity and remove the source of infection, as follows. 1. Oral cleaning: food residues may accumulate in the tooth extraction wound after tooth extraction, and odor may appear after its decomposition, good oral cleaning, such as proper brushing, saline gargling, etc., can eliminate the odor. 2. Remove the source of infection: there may be residual tooth fragments, bone fragments, tartar or inflammatory granulation tissue in the extraction wound causing chronic infection, under local anesthesia, thoroughly scratch and rinse the alveolar fossa, remove foreign matter and granulation tissue can relieve infection and eliminate odor. There may be other reasons for the odor two days after filling gelatin sponge after tooth extraction, it is recommended to go to the hospital in time to receive regular treatment.