Dental cancer, i.e. gingival cancer, has no specific symptoms in early stage, so it is not easy to be detected, and with the progress of the disease, it may appear symptoms such as gum ulcers, loose teeth and so on. Gum cancer belongs to malignant tumor of oral cavity, generally speaking, there are no obvious symptoms in the early stage of the disease, some patients may have slight gum pain, and some of them may have gum decay, ulcers, swelling and loose teeth. It is usually mistaken for oral ulcers or oral tuberculosis. In the middle and late stages, it may be difficult to open the mouth and the gums may bleed. Therefore, if the gums appear uncomfortable symptoms, should consult the doctor in a timely manner, under the guidance of a professional physician to improve the examination, a clear diagnosis, and active treatment, so as to avoid delaying the condition.