Whether or not to take an anti-inflammatory injection after tooth extraction depends on the specific situation and post-operative reaction. In general, for simple extractions, where a single tooth is removed without incision, suturing, bone removal, etc., a little oral anti-inflammatory pain medication is sufficient after the extraction. For loose teeth, especially simple extractions, oral anti-inflammatory medication can also be dispensed with. If it is a more complicated extraction, especially some wisdom teeth extraction, which may require incision and suture, and also need to remove part of the alveolar bone, the postoperative reaction may be more serious, and some anti-inflammatory painkillers can be used after the operation. If the swelling is very serious, anti-inflammatory injections can be given and water can be hung to reduce the post-operative reaction. Generally, if hanging water is recommended, 2-3 days is enough.