Bad breath may occur because patients with poor stomach and intestines often have indigestion, poor gastrointestinal peristalsis, food stays in the stomach for too long after eating, and the food ferments in the stomach, which creates a foul odor, and the odor is exhaled from the mouth when speaking. In addition, patients with gastrointestinal problems are often combined with Helicobacter pylori infection, Helicobacter pylori not only in the stomach, but also in the oral cavity will be colonized, the oral urea decomposition into odor. Therefore, patients with poor stomach and intestines should adhere to small meals, each meal can eat eight minutes full, appropriate activities after meals, avoid raw, cold, hard and spicy stimulating food intake. In addition, you can also take mosapride, domperidone, gastric tablets, itopride, etc. to promote digestion. If the test is positive for Helicobacter pylori, acid suppression and anti-infection correction can be given to promote recovery.