Tooth extraction itself is an invasive procedure, and as long as it is invasive, there is a risk of infection. Post-extraction infections are commonly caused by poor postoperative oral hygiene or chronic inflammation of the original extraction wound. For post-extraction infection, the clinical symptoms are that post-extraction infection often occurs after 3 days of extraction, accompanied by redness, swelling or pus overflow from the extraction wound, and a bad taste in the mouth. The systemic condition is sometimes feverish, and the further development of the infection may cause osteomyelitis of the jawbone, peripheral gap infection, and even cause a series of symptoms such as limitation of facial opening, etc. For the post-extraction infection, the pus drainage of the extraction wound should be carried out as soon as possible, and the systemic anti-inflammatory drugs should be applied to control the infection as soon as possible to avoid its proliferation.