After wisdom tooth extraction, it takes about 3 months for the alveolar bone to completely heal and grow flat. During this period, there will be an obvious hole in the extraction socket, which is prone to food retention. The cavity may not heal properly after 3 months. The cavity will be completely flattened after 3 months, so the patient does not need to do other treatment, just brush it well when brushing, to avoid the accumulation of food that will lead to the decay of the teeth in front of the extraction socket.