Waking up in the morning with bad breath may be caused by inadequate oral cleaning, oral inflammation or systemic diseases, corresponding to oral cleaning, periodontal treatment or other diseases. 1. Oral cleaning is not in place. If the night before brushing oral cleaning is not in place, there are food residues left in the mouth, after a night of fermentation, bacterial reproduction will appear bad breath, this time you need to get up in the morning to effectively brush your teeth, use dental floss to clean the gap between the teeth to remove the soft residue in the oral cavity. 2. Oral inflammation. If you have gingivitis, periodontitis, gums due to inflammation will appear abnormal secretions, or even pus bad breath, this time you need to carry out periodontal treatment, eliminate gum inflammation bad breath will generally be significantly reduced. 3. Other diseases. Halitosis may also be caused by respiratory diseases or digestive diseases such as bronchitis, gastric ulcer, gastritis, need to go to the hospital for examination and appropriate treatment. Morning generally have varying degrees of bad breath, but if severe bad breath occurs for a long time, it is recommended to go to the hospital for examination and treatment.