First, you should brush your teeth and rinse your mouth carefully and go to the hospital for ultrasonic scaling. By washing your teeth, you can remove dirt such as tartar and dental plaque around and between your teeth, create a good oral hygiene environment, and thus achieve the effect of refreshing your breath.

Second, you can eat drugs that clear away heat and reduce fire, such as oatmeal, Niuhuang Shangqing Pill and Chuanxinlian Tablet. In addition to body heat, it can also relieve bad breath;

Third, in order to avoid bad breath caused by excessive stomach fire, diet should be based on light and digestible foods, avoid greasy sweets, avoid overeating every meal, and exercise properly after meals;

Fourth, if bad breath is caused by excessive liver fire, you can take drugs such as Longdan Xiegan Pill and Xiaochaihu Decoction to reduce fire.