Bad breath in the morning may be caused by poor oral hygiene, gingivitis, periodontitis, oral ulcers, etc., which can be remedied by brushing teeth, using mouthwash, removing calculus, using medication and so on. 1. Poor oral hygiene: If you didn’t brush your teeth the night before or ate flavorful food, you will be prone to bad breath the next day, which can be alleviated by brushing and rinsing your teeth adequately. 2. Gingivitis: gingivitis patients will also have bad breath symptoms, mainly due to plaque and calculus in the teeth, patients can be ultrasonic scaling, to rinse the medicine, bad breath will gradually improve. 3. Periodontitis: Patients with bad breath caused by periodontitis also need to remove tartar. In addition, you can also take metronidazole, amoxicillin and other drugs to inhibit bacteria. 4. Mouth ulcers: patients with mouth ulcers may also have bad breath in the morning, patients can use chlorhexidine gargle, mouth ulcers, watermelon cream, etc. for treatment, the ulcers get better after the symptoms of bad breath will also get better. It is recommended that the patient first in the doctor’s help to find out the cause, and then corresponding treatment, the use of drugs need to follow the doctor’s advice.