Wake up in the morning bad breath may be due to oral caries, may also be due to chronic gastritis and other diseases, may also be due to dry syndrome and other diseases. 1. Caries: When caries occurs, the bacteria in the patient’s mouth multiply, which can lead to the symptoms of bad breath in the morning. For treatment, caries can be treated with sodium fluoride glycerin paste or silver nitrate, and carious tissues can also be removed by surgical methods. 2. Chronic gastritis: chronic gastritis is a chronic inflammatory lesion of the gastric mucosa caused by Helicobacter pylori, duodenal-gastric reflux, autoimmunity, age and other etiological factors, and patients with chronic gastritis can also experience symptoms of bad breath due to indigestion, Helicobacter pylori infection and other reasons. Treatment can use clarithromycin, amoxicillin, bismuth potassium citrate, bismuth pectin, omeprazole, lansoprazole and other drugs for the eradication of Helicobacter pylori treatment, for the people with symptoms of dyspepsia, you can also give domperidone, polypeptide enzyme tablets, yeast tablets, and other drugs to treat dyspepsia. 3. Dry syndrome: patients with dry syndrome may have symptoms of dry mouth, because dry mouth can lead to the oral cavity’s self-cleaning function is weakened, so the patients may wake up in the morning with symptoms of halitosis. Treatment should be directed at dry syndrome, can be given glucocorticoids, cyclophosphamide, azathioprine, rituximab and other drugs for treatment. In addition to the above factors, other causes can also lead to the symptoms of bad breath in the morning, if the symptoms continue to be unrelieved, please consult a doctor in time to find out the cause, so as not to delay the condition. Use medication under the guidance of a physician.