Children’s bad breath, dry and hard stools may be caused by accumulation of food, functional constipation, indigestion, and can be treated by improving lifestyle and using medication. 1. Accumulation of food: children’s bad breath, dry and hard stools may be caused by accumulation of food, you can drink more water, eat more fresh fruits and vegetables, such as apples, celery and so on, in order to promote the digestion and absorption of food. Avoid spicy, stimulating food. Strengthen sports and exercise, such as running, can enhance the peristalsis of the gastrointestinal tract, which is conducive to the digestion and absorption of food, and can alleviate the symptoms of halitosis, dry and hard stools. 2. Functional constipation: long-term retention of food in the gastrointestinal tract, gastrointestinal peristalsis slows down can lead to children with bad breath, dry stools, defecation symptoms of functional constipation to reduce the number of times, this situation can be used to use lactulose and other laxative, if necessary, can be used to laxative drugs such as montelukast. 3. Indigestion: when the child’s diet is too much or too mixed, it can lead to indigestion, bad breath, dry and hard stools and other symptoms, it is recommended that oral probiotics to regulate gastrointestinal function, such as bifidobacteria, bacillus subtilis bifidus, and other intestinal flora. Or oral compound pepsin powder, etc., to promote intestinal digestion. There may be other reasons for children’s bad breath and dry and hard stools, such as incomplete intestinal obstruction, etc. If the above symptoms are serious, or if the symptoms do not improve, you should go to the hospital in time for treatment. All of the above medications should be used under the guidance of a doctor, avoid self-medication.