Ulcers on the tooth bed are usually self-healing, usually in about 7-15 days. However, if it is not an ulcer, but an abscess similar to an ulcer due to a fistula at the root tip, then treatment of the tooth is required to resolve it. It is also necessary to first take a radiograph and then observe the root tip for a low-density image. If there is a shadow at the root tip and indeed the tooth has biting pain, it needs to be opened and drained first, then the root canal should be prepared, sealed and anti-inflamed from the root canal, and oral anti-inflammatory drugs should be taken, which can be oral amoxicillin plus metronidazole. If you are allergic to penicillin, you can also use erythromycin. After the fistula has healed, it can then be tightly filled. If the fistula does not heal in time, the fistula can be removed and then tightly filled. After observing that there are no symptoms, it is recommended to have porcelain crowns and inlays to ensure the longevity of the tooth.