If bad breath is caused by poor hygiene, you need to pay attention to brushing, if it is caused by oral causes such as dental caries, you need to fill the teeth, and if there is Helicobacter pylori infection, you can take medication. 1. If there is bad breath, first of all, you need to check whether you have not brushed your teeth, you need to develop a correct way of brushing your teeth. Oral diseases can cause bad breath, such as the presence of dental caries, you need to remove the decayed material in the teeth, fillings and so on. If there is periodontitis, there will also be bad breath, you can carry out periodontal treatment, including scaling, periodontal scaling, etc.. 2. In addition, bad breath can be caused by the digestive system, and the common cause is Helicobacter pylori infection, which can be treated with quadruple therapy, such as the use of clarithromycin, amoxicillin, bismuth potassium citrate, and omeprazole. If halitosis is obvious, go to the hospital in time, and follow the doctor’s instructions when using the above medications.