Getting up in the morning with bad breath and saliva in the mouth may be caused by open-mouth breathing, or it may be caused by oral diseases and gastroesophageal reflux. 1. Some people will have the habit of breathing with their mouths open when they go to bed at night, and when they get up in the morning, there will be saliva in their mouths, and there is usually a dry throat. If the mouth is not properly cleaned the night before, food residues left in the mouth may also lead to bad breath. 2. In addition, if you suffer from pulpitis, periodontitis, dental caries, oral ulcers and other oral diseases, the patient will also have bad breath symptoms, usually accompanied by swollen and painful gums, oral secretions and other symptoms. In addition, if there is gastritis, gastric ulcer and other diseases, resulting in gastroesophageal reflux, may also cause bad breath, increased oral secretion symptoms. Patients are advised to seek prompt medical attention for treatment when symptoms persist.