Because of the symptoms of bad breath due to poor gastrointestinal, poor digestion, food can not be digested and absorbed in time, the main thing is to treat the cause, the symptom. If you have abnormal stool, irregular stool, you can take drugs to regulate intestinal flora; if the stool is dry, you can take some gastrointestinal dynamics drugs, keep three regular meals, eat more coarse fiber food; if you have symptoms of gastritis, you can take drugs to inhibit gastric acid secretion and protect the gastric mucosa. Frequent bad breath may also be related to H. pylori infection, you can do a carbon 13 or carbon 14 breath test. If you have H. pylori infection, you can choose a sensitive antibiotic treatment or use quadruple therapy. H. pylori infection has the possibility of recurrence, so you must exercise more and strengthen your body to avoid recurrence.