Bad breath is the foul odor emitted from the mouth or other air-filled cavities such as the nose, sinuses, or pharynx, and it seriously affects people’s social interactions and psychological health. So what are the common causes of bad breath? How to deal with it? 1, the oral cavity itself problems oral cavity with untreated dental caries, root remnants, gingivitis, periodontitis and oral mucosal disease can cause bad breath. These diseases may lead to bacterial infection and thus emit bad odor. So first of all, you need to choose the correct brushing method, brush at least 2 times a day, and develop the habit of rinsing your mouth after eating. In addition, timely visit to the regular hospital dental clinic to deal with the disease in a timely manner. 2, the infection of Helicobacter pylori in the stomach Helicobacter pylori can induce gastritis, gastric ulcer and even gastric cancer and other gastric diseases, but most patients infected with Helicobacter pylori do not have obvious abdominal discomfort, but there will be obvious bad breath. Therefore, screening for H. pylori is necessary for patients who do not have oral disorders but have significant bad breath. If found, promptly be formal quadruple eradication of H. pylori treatment. 3, intestinal diseases colitis, constipation and other diseases can lead to intestinal dysfunction, especially constipation, in serious cases, many days can not defecate, will also appear bad breath. In response to the above symptoms, timely symptomatic treatment, constipation is given laxative treatment, intestinal dysfunction is given intestinal probiotic adjustment, etc.