Benign tumors of the oral cavity are distinguished from malignant tumors mainly by their morphology, growth rate, activity, and relationship with surrounding tissues. 1. Morphology: benign oral tumors usually have good morphology and smooth surface, while malignant tumors often have ulceration, erosion and bleeding. 2. Growth rate: benign oral tumors usually grow slowly; malignant tumors grow fast and may be accompanied by pain. 3. Mobility: benign oral tumors usually have good mobility if they are a whole. Malignant tumors have poor mobility and often become infiltrative. 4. Relationship with surrounding tissues: benign oral tumors usually have no adhesion with surrounding tissues, while malignant tumors have hard base and adhesion with surrounding tissues. But distinguish benign and malignant tumors can not be judged only from the symptoms, the final judgment depends on the postoperative pathology, it is recommended to go to the regular hospital stomatology department, the physician through clinical experience or preoperative biopsy to determine the treatment plan.