You can’t sterilize the cavity yourself with a cotton ball after tooth extraction. Bite the cotton ball to stop bleeding after tooth extraction, spit it out in half an hour or so, avoid brushing teeth and rinsing mouth within 24 hours, and you can eat warm and cool liquid food mainly. After spitting out the cotton ball, the alveolar fossa will form a blood clot to close the wound, because the mouth is in a moist environment, the extraction of the fossa appears white, and will enter a small amount of food debris, it looks more abnormal than other parts of the wound, which is a normal phenomenon, do not need special treatment. Inside the cavity of the extracted tooth, you can’t wipe it with a sterilized cotton ball, which will easily cause the local mucous membrane to rupture and bleed, increasing the chance of infection. Abnormalities in the cavity of the extracted tooth, you need to consult a doctor in a timely manner, under the guidance of the doctor to check and deal with, avoid wiping with disinfectant cotton balls, to avoid adverse consequences.