Clinical oral malodor measurement with a portable sulfide monitor


M. Ueno, Department of Oral Health Promotion, Graduate School, Tokyo Medical and Dental University, 1-5-45 Yushima, Bunkyo-ku, Tokyo 113-8549, Japan. Tel: +81 3 5803 5477, Fax: +81 3 5803 0194, E-mail:


Objective:  The aim of this study was to evaluate the clinical ability of Breathtron® by comparing it with other malodor measurement procedures: the organoleptic test (OT) and gas chromatography (GC).

Subjects and methods:  Patients were 475 patients who visited a fresh breath clinic. Oral malodor was measured with the OT, GC, and Breathtron®. Correlation analysis and two linear regression analyses were conducted to examine the relationship of the Breathtron® values with OT scores and volatile sulfide compound (VSC) concentrations by GC: i.e. the regression of Breathtron® on OT and the regression of Breathtron® on total VSCs by GC. Receiver operating characteristics (ROC) analysis was conducted to investigate the sensitivity and specificity of Breathtron®.

Results:  The Breathtron® values were significantly correlated with OT and VSCs by GC. In the regression analysis, predicted Breathtron® values were 199.3 and 520.1 ppb for OT scores 1 and 2, and reasonably close to total VSCs by GC between 550 and 750 ppb. The ROC analysis demonstrated that Breathtron® is a useful and valuable adjunct measurement tool.

Conclusions:  Breathtron® is a simple, rapid and reliable appliance for screening oral malodor if an appropriate malodor threshold level is chosen.