Generally, dry mouth, bitter mouth and bad breath are related to poor oral hygiene. It is generally because there are teeth in the mouth that will cause bad breath. In addition, it is also related to the digestive and respiratory systems. It is suggested to take timely treatment. At ordinary times, we should pay attention not to eat spicy food, but drink more warm water. We can eat more balsam pear, watermelon, winter melon and other foods to relieve the fire. We can also drink green tea, chrysanthemum tea, and honeysuckle tea to relieve the symptoms of dry mouth and bitter mouth. Dry mouth, bitter mouth and bad breath are generally caused by bad eating habits and living habits. You should pay attention to oral hygiene at ordinary times, brush your teeth carefully sooner or later, and gargle after meals. Eat less spicy, sweet, greasy, fishy and smelly food, reduce the frequency of smoking and drinking, and also go to the department of stomatology for treatment.