Bad breath and bitter mouth can be improved by improving the gastrointestinal tract, treating diseases such as inflammation of the mouth, regular rest, reducing late nights and other ways to improve, the specific circumstances are as follows: 1, poor digestion of the gastrointestinal tract can lead to a large amount of food accumulation in the gastrointestinal tract, and finally cause damp heat, you can take a walk after eating to eliminate food, or drink hawthorn water, etc., as appropriate, to help digestion and improve the gastrointestinal tract and relieve the phenomenon of bad breath and bitter mouth; 2, if the mouth has inflammation, it is also easy to cause the phenomenon of bitter mouth, go to the hospital as soon as possible to treat oral inflammation and other diseases, can help relieve the symptoms of bad breath or bitter mouth; 3, liver fire is also one of the causes of bad breath, bitter mouth, usually try to reduce the number of late nights, to ensure that the liver has enough time to recover, improve the problem of bitter mouth, bad breath; 4, bad breath, bitter mouth should also try to eat less irritating, or smells larger food, to ensure sufficient sleep time as well as regular cleaning of the mouth.