Children’s nose is not ventilated open mouth breathing may be a foreign body blockage, cold, rhinitis, etc., and its treatment according to the different causes of general treatment and drug treatment. 1. Foreign body blockage: when a child’s nose is blocked by a foreign body, resulting in poor breathing, they will breathe through their mouths. At this time, we need to help remove the nasal foreign body, so that the airway is open, and naturally they will breathe through the nose and not open their mouths. The most common is caused by excessive nasal secretion, can be given sea salt water nasal spray, improve the symptoms. 2. Colds: when children’s immunity or cold, easy to virus infection, resulting in the occurrence of colds, inflammation of the stimulation of the nasal mucosa caused by edema will result in nasal congestion, the nose does not breathe the symptoms, will use the mouth to breathe. You can give sea salt water nasal spray, suction care and other symptomatic supportive treatment. After a period of time, it can improve on its own. 3. Rhinitis: If the child suffers from rhinitis, the inflammatory reaction leads to the nasal cavity and nasal mucosa edema, so that the cavity becomes narrow, it will not be ventilated and use the mouth to breathe. Treatment can be prescribed with saline rinse nasal cavity, if necessary, comply with medical advice oral cetirizine hydrochloride drops, loratadine tablets and other anti-allergy, mometasone furoate nasal spray anti-inflammatory treatment. When you find that the child’s nose is not open mouth breathing, it is recommended to go to the hospital in a timely manner, under the guidance of a professional doctor to deal with.