Most of the bad breath after waking up is a physiological phenomenon, but there are also some pathological problems, including the presence of a large number of bacteria inside the oral cavity and the presence of gastrointestinal Helicobacter pylori. 1. Most people in the sleep oral movement is reduced, saliva secretion is weakened, will cause oral bacteria multiply, acid fermentation produced an unpleasant odor, but oral brushing and gargling soon after the elimination of this type of belongs to the common physiological bad breath. So don’t worry too much. 2. Wake up bad breath and pathological factors, one is suffering from periodontal disease caused by another is indigestion gastrointestinal lesions caused by the need to exclude Helicobacter pylori factors caused by. You can treat them according to the actual situation. If there is a pathologic halitosis, the situation is more serious, you should go to the relevant departments for treatment.