Dental cancer, also called gum cancer, refers to malignant tumors on the gums. Gum cancer is mostly squamous carcinoma with a high degree of differentiation, of which lower gum cancer is more common than upper gum cancer. The development of gingival cancer may be related to poor oral hygiene, poor denture repair, precancerous lesions and other factors. Diagnosis is mainly based on imaging examination, routine history taking and clinical examination, especially lymph node metastasis as an important reference index. Judgment according to clinical manifestations Gingival cancer occurs in premolar and molar areas, with pain, bleeding and loosening of teeth as the first symptoms. Generally, it manifests as ulcerated type or exophytic type, with ulcerated type being more common. Superficial ulcers can grow into cauliflower-like or granular granules of varying sizes, with surface erosion, bleeding and slow growth. Second, according to the auxiliary examination to confirm the diagnosis 1, X-ray examination: can be seen in the jawbone “fan-shaped” bone destruction, the edge of the worm-like. For slow-growing patients, there may be bone proliferation at the edge of the damaged area. 2.CT examination: it can be manifested as an irregular mass of equal or slightly lower density in the gingival area of maxilla and mandible, with blurred boundary, uneven density, infiltrative growth, and different degrees of osteolytic bone destruction in the neighboring jaws. 3.Biopsy examination: gingival cancer lesions are superficial in location and easy to be biopsied and characterized.