Gingival cancer takes bone destruction, loosening of teeth and pain as clinical manifestations, and needs to be combined with imaging, pathology and histology to make comprehensive judgment. 1.Clinical manifestations: ① After tooth extraction, there are wounds that do not heal for a long time, lumps protruding or gingival ulcers that do not heal for a long time and increase rapidly. ② lesion site tooth loosening, pain. ③When the lesion develops backward to the pharynx and the posterior region of the molar teeth, it causes difficulty in opening the mouth, and when it affects the inferior alveolar nerve, numbness of the lower lip occurs. ④ Enlargement of lymph nodes in the neck. 2. Imaging examination: X-ray examination shows “fan-shaped” bone destruction of the jawbone, and the edge is worm-eaten. 3. Pathological and histological examination: local pathological biopsy can confirm the diagnosis, and it can also clarify the typology of gingival cancer and its malignant degree, which can provide reference for subsequent treatment. If you suspect that you are suffering from gum cancer, it is recommended to go to the hospital as soon as possible for examination, early diagnosis and early treatment.