Oral cancer refers to malignant tumors occurring in the oral cavity, including the lips, buccal mucosa and the anterior 2/3 of the tongue, as well as the hard palate, gingiva, and the floor of the mouth, etc. Among them, squamous carcinoma is the most common pathological type. Domestic literature reports that the incidence rate of oral cancer is 1.06/100000-1.69/100000, and oral cancer accounts for 1.9%-3.5% of systemic malignant tumors and 4.7%-20.3% of malignant tumors of the head and neck. India and Southeast Asia, the high incidence of oral cancer, the incidence rate of men is about two times higher than that of women, and the peak age of the disease is 50-60 years old. At present, the pathogenic factors of oral cancer are not completely clear, but it is believed that there is a certain relationship with infection, betel nut chewing and smoking.