The nose is not ventilated, breathing with the mouth has the following hazards: 1, air directly from the mouth in, not through the nasal cavity of the humidification, easy to appear pharyngeal dryness, pharyngitis and other clinical manifestations; 2, the air is directly sucked in from the mouth, not through the nasal defense system of sterilization, sterilization, such patients are prone to pharyngitis, tonsillitis, bronchitis and other intrapulmonary infections. So if the patient appears to have a nose that is not ventilated, breathing through the mouth for a long time is not good for the patient’s health. For this case, it is recommended that the patient go to the ENT department to do a nasal examination to see if the patient has chronic hypertrophic rhinitis, deviated nasal septum, sinusitis with nasal polyps. Nasal endoscopy can be done, if necessary, can do sinus CT and other tests. If it is a small child, you need to exclude the nasopharynx has adenoid hypertrophy, resulting in the nose does not breathe the possibility.