There are several causes of bad breath, but the common cause is the lack of oral hygiene, which leads to the proliferation of microorganisms in the mouth. Gastrointestinal disorders can also lead to bad breath, liver and kidney dysfunction, or other physical diseases may cause this condition. Bad breath is caused by poor diet or excessive consumption of spicy and stimulating food, and poor hygiene and cleaning, as well as poor living habits, resulting in a weakened spleen and stomach function, food in the large intestine can not be digested properly, a large amount of food residues can not be eliminated and deposited in the large intestine, a long time down will produce bad breath, through the oral cavity. It is recommended to eat more fresh fruits and vegetables, drink more water, and eat less spicy and stimulating food.