It is not uncommon to see bleeding even after removing the cotton ball after tooth extraction. At this time, you can go to an oral health care institution to stop the bleeding by applying pressure to the extraction wound again, and observe whether there is blood seepage after the pressure. If the bleeding is small and there is only a small amount of blood, you can also observe it temporarily and apply local ice to constrict the blood vessels in it to see if the bleeding is effectively relieved. If the bleeding is obviously relieved or there is only blood in the sputum, there is no need to be particularly nervous, it is also considered normal, just wait for the wound to heal naturally, but if the bleeding is still serious, it is recommended to go to an oral medical institution for secondary hemostasis of the extraction wound as soon as possible.