Bad breath in Chinese medicine needs to be treated with evidence, there are causes such as hyperactive liver fire, liver and gallbladder damp heat, heat in the stomach, different cases use different drugs to treat, as follows: 1, hyperactive liver fire: patients are impatient and irritable, anxiety, tension, easy to lose temper, usually red tongue with yellow coating, pulse strings, can be used to clear the liver fire medicine, such as gentian diarrhea liver soup treatment; 2, liver and gallbladder damp heat: may be long-term smoking, drinking or eating fatty, sweet, thick and greasy, fried The patient may have bad eating habits, such as eating fried, deep-fried, cold, greasy, spicy, irritating food, which over time leads to heat accumulation in the stomach, resulting in bad breath, constipation, swollen gums, sores on the tongue, etc. Patients need to clear the stomach and relieve fire, which can be treated with stomach clearing powder.