Clinical findings
PLAQUE
Subjects in the placebo group had a slightly higher mean OPI value at baseline but the difference was not statistically significant compared with the test group (Orthodontic plaque index (OPI) on subject level (Differences were tested with an unpaired two-sided Relative change in orthodontic plaque index (OPI) scores from baseline to follow-up in the test and placebo groups. The vertical bars denote the standard error. The decrease in the test group was statistically significant (