The cotton stuffed after tooth extraction will not dissolve and must be removed or spit out by the patient. Generally, after tooth extraction, due to the tendency of bleeding, the patient will be asked to bite cotton or cotton roll on the tooth extraction wound, so as to play the role of pressure to stop bleeding, and this time can be 30-40 minutes, after this time, the patient can spit out the pressure by himself, and there will be no more obvious bleeding. However, there may be blood in the mouth or in the spit within 24 hours after tooth extraction, which is also normal and there is no need to worry too much, and the blood will gradually dissolve after 24 hours, but it should be noted that if cotton is put on the tooth extraction creation after tooth extraction, do not think it can dissolve, it must be spit out.