A white abscess on the gum is actually an apical abscess of the tooth. An apical abscess is mainly in the apical part of the tooth, where an abscess cavity is formed. Depending on the patient’s own resistance, the inflammation can recur and linger. At this time, root canal treatment is needed in the hospital, because the pulp is completely necrotic at this time, so there is no pain during the treatment and no need to worry. The root canal is opened, the necrotic pulp is extracted, the root canal is expanded and filed, the canal is flushed after expansion, and then anti-inflammatory medication is sealed in the pulp cavity, and after a week of sealing, the medication is removed and the tooth is filled with a filling material. Since the pulp is no longer viable, it is best to also make a crown restoration on the outside to prevent the tooth from splitting.