Generally, the causes of children waking up with bad breath include the following: first, children with indigestion, children with indigestion will cause bad breath after waking up, the tongue is often very thick and greasy, there will also be abdominal pain, bloating and other uncomfortable symptoms, can be given to eliminate food and stagnation treatment, for example, taking Wang’s Bao Chi Wan, compound chicken neijin san, etc. Secondly, the symptoms caused by H. pylori infection in children, children with H. pylori infection can also cause bad breath after waking up from sleep. Children often also have pain in the upper abdomen, and should be promptly checked for antibodies to H. pylori in the blood to confirm the diagnosis.