Hi thanks for contacting health care magic... According to your complaint it doesn t seems severe chronic liver disease. In hepatic encephalopathy like chronic liver condition foul smell can come from mouth ..As a result of sulphur containing amino acids like mercaptan... But it usually occur in patient of cirrhosis like chronic liver disease... He should limit alcohol drinking ... The maximum safe limit is 20 gm/litre. Here advise her to maintain oral hygein with two time brushing after lunch and dinner... Water taken more... Oral mouthwash can be used.... If still smell there proper physical examination needed by doctor... Take care... Dont worry... Regular USG study and liver enzymes study useful for identifying liver pathology... Dr.Parth Goswami