The purpose of this study is to analyze the correlation between cause and the element of mouth odor through measurement and identification of mouth odor and is to apply to effective method for elimination of halitosis. Subjects were 108 people who visited Dong Pusan College University and lived on Busan. Cross-sectional survey was used and mouth odor was measured by Oralchroma. Oral examination proceeded with status of oral health. Statistical analysis was performed with SPSS version 13.0 for window.