After wisdom tooth extraction, food residue may be attached around the wound, but it will not grow into the flesh, so patients do not need to be too anxious. At the early stage after wisdom tooth extraction, due to the saliva mixed with some bloody exudate and the pain felt by the patients, most of them dare not brush their teeth or rinse their mouths, so over time, food residues tend to accumulate around the wound or fall into the cavity created after tooth extraction, and due to the hidden location, the mouth is easy to clean incompletely and make them remain there. However, patients do not need to be too anxious at this time, because after tooth extraction, the doctor will use cotton balls to press the cavity to produce a blood clot in the wound, and the fallen residue does not really enter the wound; at the same time, as the wound heals, the blood clot gradually becomes alveolar bone, and the cavity gradually grows flat, and then the food residue will be ejected. Therefore, the food residue does not grow into the flesh. After wisdom tooth extraction, pay special attention to oral hygiene, rinse your mouth in time after eating, and at the same time, brush your teeth gently, use a softer toothbrush, and avoid overheated food to prevent damage to the extraction wound and affect its healing.