Oral cancer is a general term for malignant tumors that occur in the oral cavity. Most of them belong to squamous epithelial cell carcinoma. Oral cancer includes gum cancer, tongue cancer, hard and soft palate cancer, jaw cancer, floor of mouth cancer, oropharyngeal cancer, salivary cancer, lip cancer and maxillary sinus cancer as well as cancers occurring in the skin mucosa of the face and face, etc. It is one of the more common malignant tumors of the head and neck. The incidence of oral cancer has been on the rise in recent years. Choosing a healthy lifestyle and actively treating and preventing chronic inflammation of the oral cavity and mucosal ulcers can prevent the occurrence of oral cancer. How to prevent oral cancer? 1. To have a healthy oral environment. Many people will have unhealthy teeth, such as carious teeth, residual roots, residual crowns and uncomfortable dentures, which are not only the habitat of bacteria, but also the oral mucosa will be mechanically damaged, and such oral environment is more likely to form long-term chronic oral ulcers, which will easily form oral mucosal malignant tumors in the long run. So when it comes to unhealthy teeth, early dental repair is the basis for ensuring a healthy oral mucosa. 2.Good mood. People live due to the pressure of life, work or some unexpected events, the psychological pressure is too heavy. Clinically, it manifests as recurrent oral ulcers and flat moss fresh-like erosion. These are the risk factors of oral cancer. Therefore, maintaining a good mood is also an important factor to prevent the production or recovery of oral mucosal lesions. 3.Regular work and rest time. In modern city life, many people have the habit of sleeping late. Irregular work and rest time is also a factor that can cause mouth ulcers. From the theory of Chinese medicine, “the night to raise yin, day to raise Yang”, sleep late is easy to Yin deficiency Yang hyperactivity, false fire within the birth; false fire on the inflammation, it is manifested as mouth ulcers. So a good work and rest time is essential for the recovery of mouth ulcers. 4, healthy and reasonable eating habits. Healthy and reasonable eating habits are very important to the prevention of oral diseases. First of all, to ensure the supply of nutrients for our three daily meals, the nutrients required by the human body include thermogenic nutrients: protein, lipids, carbohydrates, non-thermal nutrients include: vitamins, minerals and water. The three major thermogenic nutrients try to match our three meals in a reasonable proportion: the proportion of protein: 10%-15%, the proportion of lipids: 20%-25%, the proportion of carbohydrates: 20%-70%. Second, while meeting the basic nutrients, try to ensure a variety of food, eat more fresh vegetables and fruits, and eat less unsaturated fatty acid-based fatty meat, halo oil and other animal fats. Increase the intake of trace elements and vitamins. The main vitamins that are protective for oral mucosal disease are: vitamin A, vitamin B2, etc. Vitamin A is a fat-soluble vitamin that has the ability to protect and maintain the integrity of the mucous membrane layer of the skin. The best sources of vitamin A: animal liver, cod liver oil, fish eggs, milk, eggs, etc. Good sources of vitamin A pro-vitamin: dark green or red-yellow vegetables and fruits, such as: broccoli, carrots, bok choy, amaranth, etc. Vitamin B2 deficiency can also lead to mucosal changes, manifested as stomatitis, mouth ulcers, sclerositis, scrotum infection, etc. Animal foods rich in vitamin B2 include liver, kidney, heart, egg yolk and milk; among plant foods, green leafy vegetables (especially spinach, leek and rape) and beans contain more; fruits also contain a certain amount; cereals and grains are the lowest (especially milled grains and grains). Again, to ensure that the food is fresh. Moldy cereals (such as: corn, peanuts, etc.) will produce carcinogenic substances aflatoxin; pickled pickles, with different doses of carcinogens nitrite in different times of pickling. Then, the food must be light and less fried, do not eat spicy and stimulating things. Fried food, not only high fat content is not conducive to the proportional distribution of dietary structure, but also the process of deep-frying food, protein in the process of deep-frying and grilling, producing a large number of carcinogenic substances stupid and. For patients with post-operative oral cancer or oral ulcers, there may still be sores in the mouth, so the friction of chewing food may be a process of re-injury to the sores. Try to make fresh food into soft, semi-liquid or liquid food. Finally, give up bad habits. Chewing betel nut, smoking tobacco, drinking alcohol and spicy food are the risk factors to cause oral cancer, so it is necessary to quit bad habits. In conclusion, prevention and treatment of chronic oral mucosal lesions and correction of bad habits can significantly reduce the possibility of recurrence and occurrence of oral malignant tumors.