Oral cancer poses a significant threat to human life, and it is important to pay attention to early oral diseases to achieve the goal of early detection and treatment. There are many causes of oral cancer, mainly including the following points: The first is the patient's poor dietary habits, such as long-term alcohol abuse and smoking. Eating hard foods frequently can also cause chronic inflammation. Moreover, neglecting oral hygiene and not having the habit of brushing teeth morning and night can lead to the growth of bacteria and fungi, causing inflammation in the mouth, which can induce oral cancer. Another cause is prolonged irritation of the oral mucosa by inflamed gums, the roots of teeth, and unsuitable dentures, which can produce chronic ulcers and carcinogenesis. A deficiency in vitamin A is also somewhat related to the development of oral cancer.