In fact, bad breath is what we often say. What should bad breath do? Symptomatic treatment should be given to the causes of bad breath. In fact, there are many reasons for bad breath. Oral diseases can cause halitosis, such as chronic inflammation of gums and periodontal tissues, oral ulcers and mumps. In terms of treatment, the first thing is to treat these primary diseases of the mouth, brush your teeth frequently, rinse your mouth frequently and keep your mouth clean. In fact, some diseases of digestive system and respiratory system can also cause dyspnea, because our mouth is connected with digestive tract and respiratory tract. Some patients with chronic respiratory diseases, such as chronic bronchitis, may cough repeatedly, and expectoration through it will lead to a taste in the mouth, and people who smoke for a long time will also have a breath. In this case, it is necessary to actively quit smoking and treat the primary disease of respiratory system. There are also some patients with indigestion who also have a bad breath, and some foods can't be digested. At this time, we should pay attention to the law of diet, which is relatively light. Don't overeat. We can add some digestive drugs to improve the symptoms of indigestion, which can help us improve our breath.