10-year-old children sleep with their mouths open may be habitually open mouth, teeth, colds, adenoid hypertrophy and other reasons, generally through different ways to be able to correct. 1. Habitual open mouth: nasal breathing is smooth, and did not use the mouth to breathe, only the mouth is natural, habitual micro-open, do not need special treatment. 2. Dental irregularities: such as buck teeth, etc., can be corrected through the teeth to change the mouth breathing. 3. Cold and flu: the open-mouth breathing caused by cold and flu is usually short-term, and the open-mouth sleeping will disappear after the cold and flu recover. 4. Adenoid hypertrophy: it is a pathologic hyperplasia caused by repeated stimulation of local inflammation, which can be treated by surgery. There may be other reasons why a 10-year-old child sleeps with his mouth open, so we suggest that you consult a doctor in time and standardize your treatment under the guidance of the doctor, so as to avoid any negative consequences.