Gum cancer is also a common oral cancer, generally more common in the mandibular gum cancer than the maxillary gum cancer, which occurs between 50 and 70 years old, often in the posterior region. Its etiology is not very clear yet, but long-term chronic stimulation is an important factor. For example, the chronic stimulation of overheated or spicy food, heavy smoking and alcohol consumption, residual roots and crowns left in the mouth, unsuitable dentures and brackets, etc. In particular, the roaming doctors in street dental stalls under the banner of “new technology and fast veneering” use self-consolidating plastic to fill in the mucosa of the alveolar process of missing teeth, causing bad chronic stimulation and forming cancer-causing factors, so we should pay more attention to them. The early symptoms of gum cancer are mostly unconscious. If it extends to the alveolar process, it will cause pain, loosening or loss of teeth there, and if it continues to develop, it may invade the surrounding tissues, causing enlargement of the side, affecting chewing food and difficulty in opening mouth. When secondary infection occurs, it can produce severe pain and cause local bleeding and foul odor. It is important to distinguish between early symptoms of gum cancer and periodontitis. Both produce loose teeth and toothache, but the causes of the two occur for fundamentally different reasons. Gum cancer is caused by the thickening of gum mucosa and the tendency to form ulcers, while periodontitis is mainly caused by pus overflowing from periodontal pockets and resorption of alveolar bone, swollen gums and smooth mucosa without proliferative manifestations. However, many early symptoms of gum cancer are misdiagnosed as periodontitis and the teeth are mistakenly extracted, so that the extraction wound does not heal and the growth of cancer tumor is accelerated. The prevention of oral cancer lies in reducing foreign stimulating factors, actively treating precancerous lesions, and improving the body’s ability to resist diseases. Many patients, after learning that they are suffering from oral cancer, often think that it is incurable disease and do not actively carry out treatment, or have the mentality of fluke and hope for treatment by some partial prescriptions, which may delay the disease and lose the opportunity of treatment.