Medical center personnel were screened organoleptically for bad breath by 2 investigators
using Rosenberg scale 0-5, and measurement of breath sample in portable gas chromatograph.
With a threshold score of 2 or more, or 75parts per billion(ppb) hydrogen sulfide(H2S),
subjects invited to enter clinical trial of the mechanical effect of daily tongue scraping
with the adjunctive use of 0.12% chlorhexidine gluconate mouthwash or 0.1% stabilized
chlorine dioxide mouthwash. Subjects randomly assigned in double-blind trial for one week.
The null hypothesis is there will be no difference between the two rinses as adjuncts to
tongue scraping.