It is not allowed to spit or spit blood within 1-2 days after the tooth has just been extracted, because after the tooth has been extracted, a clot will be formed in the socket, and in the following 24 hours or so, the clot will slowly grow fibers and cells, which will make the clot harder and harder. The formation of the clot will help to stop the bleeding of the extracted tooth, so that the socket can heal and fill up as soon as possible. At this time, if you rinse your mouth, spit or spit out blood in a hurry, you may get out the blood clot that has already formed, causing the extracted tooth to bleed again, which may even lead to dry socket. If there is too much saliva within 1-2 days after the tooth has just been extracted, it is recommended to swallow it back, and usually by the 2nd day there will only be some small amount of blood, and there will not be too much bleeding.