Figure 3.

Relative optical density (OD_600nm) value reduction rate of (a) Streptococcus mutans and (b) Candida albicans exposed to Glycyrrhiza uralensis extract with concentrations of 50, 100, 150, and 200 µg/mL at two different times. The same lowercase letters show no significant difference in relative OD_600nm reduction rate between the experimental groups at each time point (p > 0.05). The different uppercase letters indicate significant differences in relative OD_600nm reduction rate between 12 and 24 h for each experimental group (p < 0.05).