There are many causes of bad breath, which can be best adjusted by taking herbal formulas, commonly known as Xiao Cheng Qi Tang, Ping Gastric San, Aloe Vera Tang, Zuo Gui Drink, etc. These herbal formulas are used in different ways for bad breath. For example, Ping Gastric San can be used to treat bad breath caused by excessive stomach fire, which is more effective. Xiao Cheng Qi Tang is also effective for bad breath caused by constipation. For the treatment of bad breath, the application of herbal remedies is the best choice. It can also be treated by good lifestyle habits, including exercise and diet modification. For the treatment of halitosis, it is best to choose the medication reasonably under the diagnosis of the hospital doctor for symptomatic treatment.