The gums are swollen, and if periodontitis requires periodontal treatment, apical periodontitis requires root canal treatment. 1. Periodontal treatment: For the gum abscess caused by periodontitis, it is necessary to incise and drain the abscess in the acute stage, and after the acute stage, it is necessary to clean the teeth and scrape under the gum to remove the plaque and calculus in the periodontal pockets thoroughly, to reduce the stimulation of the periodontium, and place iodized glycerin in the periodontal pockets to promote the recovery of the inflammation. 2. Root canal treatment: The apical periodontitis that occurs when the pulp is necrotic due to dental caries or other physical and chemical stimuli, resulting in swollen gums, requires root canal treatment of the tooth to remove the infected lesion and eliminate the swollen gums. Swollen gums need to seek medical attention in a timely manner, under the guidance of the doctor for examination and treatment, to avoid delays in the condition.