If children eat too much, especially if they drink too much milk or eat too much meat, the food or milk exceeds the child’s digestive capacity, causing functional indigestion, that is, accumulation of food; at this time, children will have bad breath, white tongue and other symptoms; parents can give children the application of anti-eating drugs, such as large hawthorn pill; secondly, the infection of H. pylori, H. pylori infection will also lead to children with bad breath, white tongue, and often accompanied by abdominal pain, anorexia and other symptoms.