Children’s bad breath can be caused by oral impurity, dental disease, indigestion, tonsil stones, etc. Depending on the cause, targeted treatment is needed. The symptoms can be improved by cleaning the mouth, treating dental diseases, promoting digestion and cleaning tonsil stones. 1. Cleaning the mouth: children need to clean the mouth after eating, rinse the mouth after meals and brush the teeth in the morning and evening, which can improve the symptom of smelly mouth. 2. Treatment of dental disease: If you suffer from dental caries, periodontitis, gum infection, etc., there will be bad breath, timely treatment of dental caries, may require the use of amoxicillin, metronidazole and other anti-infective treatments, brushing every day to do a thorough cleaning of the teeth. 3. Promote digestion treatment: children will have bad breath when indigestion, adjust the diet structure, try to eat some easy to digest food, you can use probiotics to help improve the function of the digestive system, such as bacillus subtilis bacillus granules and so on. 4. Clean up tonsil stones: tonsil hypertrophy and enlargement, easy to hide dirt, the formation of tonsil stones, will also have bad breath, need to go to the hospital to clean up the treatment, such as stone stripping surgery. Children often mouth odor, need to take the child to the hospital, identify the cause of timely treatment. Drugs need to be used under the guidance of a doctor.