Breathing through the nose is part of the body’s normal breathing, no effect on the human body, but breathing through the mouth may affect facial development, not conducive to good health, in addition to some disease conditions, such as sleep apnea, etc., can also appear to breathe with the mouth open, it should be noted that the timely visit to the hospital for medical treatment. In general, people are using the nose to breathe, the nostrils of the nasal hair can filter harmful substances in the air as well as larger particles, to avoid harmful substances and particles damage to the nasal mucosa and respiratory tract, triggering rhinitis, tonsillitis and other diseases. At the same time, the vascular tissue in the nasal mucosa can also improve the humidity of the air, making the air more moist and reducing the irritation of the air on the respiratory tract. However, breathing through the mouth is easy to make harmful substances directly into the respiratory tract and lungs, causing harm to the respiratory tract as well as lung tissues. At the same time, long-term breathing through the mouth will affect the normal development of the face, resulting in jaw deformities, lip ectropion, and maxillary anterior teeth protrusion. It is recommended to correct the habit of breathing through the mouth, if due to nasal diseases or adenoid hypertrophy hiccups factors cause breathing difficulties with the nose, sleep apnea syndrome and other conditions such as open-mouth breathing, you should promptly go to the regular hospital to seek medical treatment, and follow the doctor’s instructions for treatment.