There are many reasons why children sleep with their mouths open, such as indoor too dry, or may be the cause of disease causing the upper respiratory tract abnormalities, if necessary, you need to take your child to the doctor in a timely manner, to clarify the cause of the symptomatic treatment. 1. Environmental factors: If the indoor air is too dry, or the child’s nasal mucosa is dry and swollen, then you can use a humidifier, you can also use sea saline nasal care solution spray nasal cavity. Indoor ventilation, not too dry. 2. Disease factors: upper respiratory tract infections lead to the appearance of a runny nose, nasal congestion. In this case, it is recommended that the child drink more water, pay attention to warmth, if the cold symptoms are relieved, the symptoms of sleeping with the mouth open will also be improved accordingly. 3. Nasal cavity abnormalities: the child itself has tonsils, adenoid hyperplasia, hypertrophy or rhinitis, sinusitis and other symptoms, can also lead to sleep with mouth open, this situation should be timely to the hospital ENT consultation to identify the cause of timely targeted treatment. The above medication is recommended to be used under the guidance of a physician, if the symptoms are recurring or aggravated, it is recommended to consult a doctor in a timely manner.