This condition is often caused by indigestion mostly, but also does not exclude the child constipation caused by bad breath, it may be caused by the child’s spleen and stomach weakness. 1, consider the child’s diet structure is not reasonable, poor lifestyle caused by the spleen, stomach and intestinal function is weakened, the gastrointestinal tract heat caused by accumulation. Food in the intestine is not properly digested, a large amount of food dregs deposited in the intestine of food, it will accumulate stagnant heat caused by the. Do not eat cold, spicy and stimulating food, you can take the stomach and eliminate food tablets. Do not give the child diet is too full, drink more water, diet easy to digest, eat more fresh fruits and vegetables, can give the baby drink more milk, yogurt, bananas, etc.. 2, oral diseases can also cause bad breath. Because of the lack of attention to oral hygiene, food residues in the teeth will be fermented by bacterial reproduction, causing bad breath. Children need to clean their teeth and develop the habit of carefully brushing their teeth. 3, gastrointestinal disease is also one of the causes of bad breath. Consider the infection of Helicobacter pylori, which secretes some smelly substances such as ammonia. So you need to do a gastroscopy, clear diagnosis, symptomatic treatment. Children’s bad breath can generally be regulated with Chinese medicine. Chinese medicine classifies children’s bad breath into two categories: damp heat and food accumulation in the stomach meridian. Parents are advised to go to the hospital in time to avoid that it will affect the child’s social life and mental health.