Bad breath is mostly due to poor oral hygiene, first of all, we should go to the hospital to clean the teeth, through scaling to remove the tartar and soft scale of the teeth in the mouth, bad breath will be significantly relieved, after scaling, we should also pay attention to daily oral hygiene maintenance, brush teeth carefully, learn to use dental floss and tooth gap brush to clean the gap between teeth, if necessary, mouthwash can be used to rinse the mouth, after taking this series of measures, bad breath will gradually disappear. Heavy breath may also be due to poor eating habits, like to eat greasy, indigestible food, and insufficient exercise, resulting in stones, food in the stomach for too long will also trigger the smell of oral corruption. Therefore, patients with bad breath should drink more water, exercise more, maintain a light and easy-to-digest diet, do not eat too much, eat seven or eight minutes full, quit smoking and alcohol, and indigestion can take stomachic tablets, large hawthorn pill and other drugs to promote digestion.