White pus on the gums may have two parts: 1, periodontal disease: if the patient has poor oral hygiene, more tartar, not timely cleaning and low resistance, may lead to inflammation of the gums, resulting in rapid swelling of the gums, the formation of periodontal abscess; 2, pulpitis is not treated in a timely manner: pulpitis is not treated in a timely manner can lead to apical abscess, which is formed first in the apical part of the root, if continued without treatment, the inflammation will spread outward along the alveolar bone, the formation of pus on the gums, and finally ulcerated to form a fistula.