Change in the TCI
The change in the TCI was determined on Day 0 (start of the study) and 3 weeks after the intervention with CPC spray (Figure Change in the tongue coating index (TCI). (a) Change over time in the cetylpyridinium chloride (CPC) spray group and (b) control group. (c) Intergroup change at 3 weeks between the CPC spray group and the control group. The orange line indicates 50%, the judgment criterion for a poor oral hygienic condition. The Mann–Whitney 