It is normal to have blood in the saliva for 48 hours after tooth extraction. After tooth extraction, the extraction wound will bleed. Generally, bite cotton ball or gauze for about 30 minutes, a blood clot will be formed in the extraction wound and the extraction wound will not continue to bleed obviously, but there may still be blood in the saliva. If there is still obvious bleeding, you can continue to bite clean cotton ball or gauze to compress the bleeding for about half an hour, if it still does not relieve, it is recommended to consult a doctor promptly for specialist treatment, and if necessary, the extraction wound needs to be pulled together and sutured or local injection of clotting medicine to reduce bleeding. However, a small amount of blood in the saliva within 48 hours is normal and no special treatment is needed. It is recommended that after tooth extraction, you must protect the blood clot, do not always lick or touch the extraction wound, do not eat overly hot or hard food, do not brush and rinse your teeth for 24 hours, and do not keep gargling or spitting out saliva to avoid affecting the healing of the wound. If there is more than bleeding, make sure to seek medical attention in time.