Parotid duct opening with ulcers, mainly by trauma trauma stimulation, mental psychological factors, lack of nutritional vitamins, physical resistance to decline in patients and other aspects of the causes. 1. Traumatic stimulation factors: parotid duct opening tissue trauma and hard stimulation factors can cause oral ulcers, such as over-sharp tooth tips, bad restorations, eat too hard food, damage to the mucous membrane of the parotid duct opening oral ulcers should be noted, if there is a pointed tooth should be ground out. 2. Psychological factors: mental overstress, overexcitement, depression or anxiety may cause recurrent mouth ulcers. 3. Lack of vitamin B elements: lack of vitamins may cause mouth ulcers, should be supplemented with vitamin-rich fruits and vegetables, which can avoid the occurrence of mouth ulcers; 4. Decreased resistance: patients who use drugs and hormones for a long time are also prone to mouth ulcers at the opening of the catheter. With the above problems, it is recommended to visit the doctor for examination and symptomatic local treatment.