First, the reason for sleeping with your mouth open: 1, acute rhinitis or chronic nasal congestion; 2, a cold leads to nasal congestion; 3. Tonsillitis or tonsil hypertrophy; Because of the above inflammation, nasal breathing is not smooth, so that nasal breathing can not meet the needs of oxygen supply during sleep, so people have to breathe through their mouths. Breathing through the mouth for a long time, due to the different internal and external air pressure, will lead to abnormal gum development, easy to dry mouth, so that bacteria directly enter the pharynx, aggravating the condition. Second, the method 1, to the hospital for examination, symptomatic treatment, generally good diseases can solve the problem of mouth opening. 2, let the patient consciously shut up and sleep, at first you can use tape to force to shut up. 3. Make sure your nose is unobstructed before going to bed, and wash your nose with cold water or take medicine.