Oral lichen planus is a very common clinical disease of the oral mucosa. Whether oral lichen planus is cancerous or not and the cancer rate of lichen planus are of great concern to doctors and patients. Current studies have found that the cancer rate of oral lichen planus is about 0.4%-2%, which means that 4-20 out of 1000 patients may develop cancer. The cancer rate of oral lichen planus is very low, so patients do not need to be overly nervous or anxious, as long as timely treatment and regular review can effectively prevent and prevent the cancer of oral lichen planus. For patients with oral lichen planus, patients should pay attention to their diet to avoid spicy and irritating foods, such as chili, pepper, hot pot to eat less, it is recommended to quit smoking and alcohol, tobacco and alcohol will have a bad stimulation to oral mucosal disease. At the same time, we should pay attention to maintain oral hygiene, remove the residual roots, residual crowns and bad restorations in the mouth, pay attention to scaling, remove calculus and soft tartar, etc. We should also pay attention to rest and adjust the general condition, such as sleep condition and menstrual disorders.