Children have bad breath.

Children's halitosis may be caused by oral hygiene, or caries, gingivitis, periodontitis, indigestion, stomach fire or constipation. It is recommended to do gastroscopy or oral examination, if it is caused by gingivitis, need to follow the doctor's advice with metronidazole to treat, usually to keep the child's oral hygiene, let the child develop the habit of brushing his teeth in the morning and evening.