Children have bad breath and halitosis, may be related to not pay attention to oral hygiene or indigestion and other factors, should be based on the specific cause of the disease to choose the appropriate treatment, such as strengthening oral care, taking probiotics to improve indigestion and so on. 1. Not paying attention to oral hygiene: If you don’t pay attention to oral hygiene, the fermentation of food residues in the mouth can easily cause bad breath and halitosis, which can be improved by cleaning the mouth, and it is recommended that you brush your teeth carefully in the morning and evening, and rinse your mouth after meals. 2. indigestion: indigestion will cause food to stay in the gastrointestinal tract for a long time, food fermentation is easy to cause bad breath, daily need to eat a light diet, eat easy to digest food, do not eat spicy stimulating food. At the same time, you can take probiotics under the guidance of the doctor to alleviate the symptoms, such as Bifidobacterium bifidum triple bacterium, bacillus subtilis double bacterium, and so on. Children with bad breath and halitosis may also have other causes, such as dental caries. It is recommended to go to the hospital in time, improve the examination to clarify the cause of the disease, and then give targeted treatment or treatment.