Foul mouth is also known as halitosis, cirrhosis halitosis in the late stage of cirrhosis is considered to be caused by physiological factors, may be cirrhosis, oral infection caused by physiological factors need to adjust the diet; need to be targeted treatment under the guidance of the doctor, such as medication, surgery and so on. 1. Physiological factors: eating some food with irritating odor, such as garlic, green onion, etc., can cause bad breath, such cases need to avoid eating food with irritating odor, and do a good job of oral hygiene. 2. Cirrhosis: patients with cirrhosis can emit liver odor, such cases should be treated for cirrhosis; with hepatitis B can use antiviral treatment with drugs such as entecavir, and can also use reduced glutathione and other drugs for liver protection; patients with ascites can be considered to carry out transjugular intrahepatic portosystemic shunt. 3. Oral infection: patients with cirrhosis are easy to be attacked by various infections, and if oral infection occurs, it will cause halitosis; if it is fungal infection, it can be applied locally with mycotoxin, and if it is bacterial infection, it can be treated with amoxicillin and other anti-infective drugs, and it is necessary to pay attention to the oral cleanliness in daily life. Cirrhosis patients with halitosis symptoms exclude physiological factors, it is recommended to go to the hospital in a timely manner, the use of medication should be carried out under the guidance of a doctor.