After tooth extraction, food debris can be removed by brushing, toothpick or cotton swab, rinsing, and seeking medical attention, so as not to cause infection and affect the healing of the tooth extraction wound. 1. Brushing: If food residues fall into the extraction socket after tooth extraction, you can use a child’s toothbrush to reach into the cavity and thoroughly remove the food residues that remain in the cavity. 2. Toothpick or cotton swab: small pieces of food debris into the cavity, you can use cotton swabs or cotton swabs to remove, and use iodine povidone to disinfect the cavity, so as not to cause infection. 3. Gargle: If large pieces of food debris fall into the cavity, you can gargle with saline or chlorhexidine gargle to clean out the food debris in time and prevent bacterial infection. 4. Seek medical attention: If you can’t clean out the debris by yourself, it is recommended to go to the hospital for rinsing in time to avoid infection. Cleaning out the food debris from the cavity in time after tooth extraction can reduce the possibility of bacterial infection, and is also conducive to the healing of the tooth extraction wound.