You can spit out the cotton ball used for pressure to stop bleeding in the mouth about half an hour after tooth extraction, and if there is still bleeding at that time, you should check the amount of bleeding. If the amount of bleeding decreases significantly and has a gradual disappearance, there is no need to deal with it because there is a tendency to bleed after tooth extraction, especially after a more traumatic extraction. But the tendency will gradually decrease with time until it disappears. The presence of slight blood in the extraction wound or blood in the saliva within 24 hours after tooth extraction is considered normal and does not require much special treatment. If there is still obvious bleeding from the extraction wound after spitting out the cotton ball, it is recommended to go to the dentistry department for secondary treatment of the extraction wound.