Usually the clot will gradually fall off 3-5 days after wisdom tooth extraction. This is also a gradual healing process, and the shedding of the clot is mostly a normal phenomenon, indicating the gradual healing of the local tissue. However, after the clot falls off, the extraction fossa is usually not completely healed and there is still a local fossa, which is commonly called extraction fossa. Generally speaking, it takes about 1-2 months for the tissue to heal completely. After the clot falls off, because the tissue of the extraction socket is not completely healed, it is necessary to pay attention to oral hygiene, such as rinsing the mouth frequently and rinsing the mouth with a little light salt water appropriately to maintain oral hygiene and reduce the residue of food residue in the local area of the extraction socket so as not to cause tissue reinfection.