Halitosis is a bad odor in mouth. The etiology of halitosis is multifactorial including intra-oral and extra-oral causes. It affects social interactions in many people. The aim of this study is to investigate an association between recognition group and non-recognition group by evaluating halitosis level and systemic factors. Nineteen participants who visited Department of Periodontology of Seoul National University Bundang Hospital were enrolled. Volatile sulfur a compounds (VSCs) were measured by Oral ChromaⓇ, a questionnaire was requested and oral exam was carried out in all subjects. Female is more sensitive than male for oral malodor. VSCs level of hydrogen sulfide(H2S) and methyl mercaptan(CH3SH) in male is higher than that in female. Participants who gave appeal dry mouth seem to recognize halitosis.

Ⅰ. INTRODUCTION
 Ⅱ. MATERIALS AND METHODS
  1. 연구계획 및 연구대상의 선택
  2. 연구방법
  3. 통계분석
 Ⅲ. RESULTS
  1. 설문지를 기반으로 한 인구사회학적 특성에 따른 구취농도
  2. 구강상태에 따른 구취농도
  3. 구취자각에 따른 다른 요인과의 관계성
  4. 구강 및 전신적인 요인들간의 다중회귀분석
 Ⅳ. DISCUSSION
 Ⅴ. CONCLUSION
 Ⅵ. REFERENCES

• 이정태(단국대학교 죽전치과병원 치주과) | Jung-Tae Lee
• 류은하(분당서울대병원 치과) | Eun-Ha Yoo
• 김근서(분당서울대병원 치과 치주과) | Keun-Suh Kim
• 박신영(분당서울대병원 치과 치주과) | Shin-Young Park
• 이인경(단국대학교 죽전치과병원 치주과) | In-kyung Lee
• 이효정(분당서울대병원 치과 치주과) | Hyo-Jung Lee Correspondence