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Oral cancer is the most common cancer and the main cause of death in countries. A major factor in the poor prognosis over the years is that a significant proportion of carcinomas are not diagnosed or treated until they are advanced. Delays in diagnosis may be due to either patients (who may not report unusual oral features) or healthcare professionals (who may not thoroughly investigate observed lesions, especially asymptomatic lesions. A significant proportion of oral carcinomas develop from malignant lesions such as leukoplakia and submucosal fibrosis. Malignant oral lesions the purpose of recognizing lesions is to prevent malignant transformation by initiating appropriate intervention.