Children’s bad breath out of breath may be related to indigestion, dental caries, poor oral hygiene, etc., the specific analysis is as follows: 1. indigestion: the baby is still small, gastrointestinal function is not perfect, easy to produce indigestion, in indigestion may cause bad breath, you can use bacillus subtilis dictyostelium granules to adjust the gastrointestinal under the guidance of the doctor, pay attention to the observation during the use of medication, so as to avoid side effects, such as nausea, vomiting, etc., if there is an abnormality in a timely manner to seek medical attention, to check the Helicobacter pylori infection and other diseases. 2. Dental caries: children with dental caries, food debris will gather in the cavity, which can also cause bad breath, you can take your child to the hospital to check, if there is caries, you need to fill the cavity. 3. Poor oral hygiene: children with poor oral hygiene, do not have the habit of brushing their teeth after meals, or brushing time is not enough, cleaning is not complete, you can give the child to use a soft-bristled toothbrush to brush their teeth, brushing more than 2 minutes each time, and combined with flossing for cleaning, the vast majority of halitosis is caused by oral problems, can be regularly cleaned, to maintain oral hygiene. Children’s bad breath may also be caused by other reasons, it is recommended to take the child to the hospital for examination and treatment.