There are more approaches that can be taken for a bitter and smelly mouth in the morning, but the cause needs to be identified and then intervened. For example, if the cause is poor oral hygiene, you can rinse your mouth and brush your teeth to improve your behavior. For those who suffer from gastrointestinal diseases, such as indigestion, they can take medication such as domperidone as prescribed by the doctor. Some people have bad living habits and poor oral hygiene, such as food debris between the teeth, soft tartar on the surface of the teeth or dental calculus, etc., which can lead to a bitter and smelly mouth in the morning. At this time, you can brush your teeth, rinse your mouth to remove part of the food debris, soft dirt, etc., and also with the use of dental floss. After sleeping at night, food can not be metabolized in time, due to the oral cavity, esophagus, stomach connected, can also cause bitter and stinky mouth in the morning. At this time, you can follow the doctor’s advice to take some drugs, such as domperidone, etc., to promote gastric power. It is also recommended not to consume too much food before going to bed at night, and should avoid bed rest immediately after dinner. Bitter and smelly mouth in the morning, it is recommended to intervene after identifying the cause. The use of medications should be under the guidance of a doctor and should not be applied on one’s own.