Brushing is not recommended for 24 hours after wisdom tooth extraction, but after 24 hours you can brush normally. However, it is important not to let the bristles or the brush head penetrate deep into the extraction wound when brushing, thus stimulating the blood clot already formed in the extraction wound, which may cause the extraction wound to bleed twice. After wisdom tooth extraction, it is recommended to compress the extraction wound for half an hour after surgery, that is, to bite the cotton ball tightly for half an hour, and the medical advice for 24 hours is not to brush teeth, not to rinse mouth, not to lick the extraction wound with tongue, and not to suck the extraction wound, and not to make the negative pressure in the mouth, because the more serious negative pressure situation may also cause the blood clot to fall off in the extraction wound. Generally, after 24 hours of extraction, the extraction wound tends to stabilize, and there will be no more bleeding unless there is strong physical stimulation.