If there is any food residue left in the wound after wisdom tooth extraction, there is usually no need to worry too much as it will not decay. If there is any food residue left in the wound after wisdom tooth extraction, you can gently rinse out the wound with light salt water of suitable temperature, which usually will not cause food residue decay. If you cannot rinse it out, you do not have to force it. As time goes by, you can also clean the wound carefully with a soft-bristled toothbrush and avoid stimulating it with hard substances such as toothpicks to avoid blood clots falling off and causing bleeding and infection of the tooth. The cavity after tooth extraction needs early healing of oral soft tissues to grow flat, which usually takes 4-8 weeks, and if the patient can maintain good oral hygiene and clean the residue of the extraction cavity in time during this period, it is unlikely that there will be stuffed food decay. In addition, the gum tissue will show a dark white color during the healing process, which is not decayed food residue and does not require special cleaning.