Bleeding from a lost tooth can be stopped by cotton ball pressure, hemostatic medication, and suturing. 1. Cotton ball compression: if you lose a tooth and bleed, you can stop the bleeding by biting on a cotton ball and holding it for about 30 to 45 minutes. If there is saliva, swallow it. If you remove the cotton ball, still bleeding, then continue to cotton ball pressure. 2. Use of hemostatic drugs: If the bleeding can not be stopped after using cotton ball compression, hemostatic drugs can be used, such as tranexamic acid, thrombin lyophilized powder, etc., which can be applied to the bleeding wound and can effectively stop bleeding. 3. Suture: some patients who have lost their teeth may be caused by injuries in the process of tooth loss or abnormal growth of the tooth root, and if the hemostatic drugs cannot achieve the therapeutic effect, they need to undergo wound suture, which can effectively stop bleeding. For serious cases, it is recommended to actively seek medical attention and receive professional treatment.