Oral cancer is called tongue cancer, buccal mucosa cancer, gum cancer, floor of mouth cancer and hard palate cancer depending on the location. Oral cancer occurs more often in middle-aged and elderly people, and more men than women. The main risk factors of oral cancer patients are that most of them have a long history of smoking and drinking alcohol, while oral cancer is rare in non-smokers and non-drinkers. Alcohol itself is not carcinogenic, but it has cancer-promoting effects. Alcohol may act as a solvent for carcinogens and promote carcinogens to enter oral mucosa. Poor oral hygiene habits of oral cancer patients create conditions for bacteria or mold to breed and multiply in the oral cavity, thus facilitating the formation of nitrosamines and their precursors. There are also long-term stimulation of foreign substances, such as tooth stumps or worn sharp tips, unsuitable dentures, which stimulate oral mucosa for a long time and produce chronic ulcers and even cancer. Long-term malnutrition, vitamin A and C deficiency and insufficient intake of iron, zinc and other trace elements are all important factors triggering oral cancer. In terms of prevention, we should pay attention to quit smoking and alcohol in daily life, not to wear poorly repaired dentures, adjust and grind tooth stumps or wear out sharp tooth tips, and treat chronic inflammation of the oral cavity in time, which are effective measures to reduce the incidence of oral cancer. If you find any abnormalities in the oral cavity and chronic ulcers in the mucous membrane of lips, cheeks and tongue that have not been cured for a long time, you should go to a specialized hospital for diagnosis and active treatment as early as possible, which can effectively control the further deterioration of cancer and have a positive effect on the treatment.