Fig. 4

2h Forest plot for meta-analysis of the post-intervention mean plaque scores of Salvadora persica compared to chlorhexidine (sub-grouped according to refrain of oral mechanical measures); (2.1) studies that refrained mechanical measures and (2.2) studies that did not refrain such measures. 3a Forest plot for meta-analysis of post- treatment Streptococcus mutans counts of Salvadora persica in comparison to placebo. 3b Forest plot for meta-analysis of the pre- and post-treatment Streptococcus mutans counts of Salvadora persica. 3c Forest plot for meta-analysis of the pre- and post-treatment Streptococcus mutans counts of placebo rinses. 3d Forest plot for meta-analysis of post-treatment Lactobacilli counts of Salvadora persica in comparison to placebo. [SP Salvadora persica, CHX chlorhexidine, **: significant difference at p = 0.05]