Oral disease caused by early morning bitter halitosis oral treatment to improve, gastrointestinal dyspepsia caused by oral medication. 1. Oral diseases include gingivitis, periodontitis, apical inflammation caused by pus on the tooth nerve, etc. The presence of inflammation can cause morning sickness and bad breath, gingivitis or periodontitis is caused by dental calculus around the teeth, which can be improved by scaling and periodontal medication. Root canal treatment is needed for apical inflammation. 2. Gastrointestinal dyspepsia, food is not fully digested in the stomach can also appear early in the morning bitter breath bad breath, eat more light food, abstain from spicy stimulation and so on. Helicobacter pylori infection will also appear bitter bad breath, you can take amoxicillin capsules, clarithromycin, bismuth combined with PPI for sterilization treatment. Therefore, you can go to the stomatology department or gastroenterology department for early morning bitter mouth and bad breath.