 Materials and Methods: 20 subjects diagnosed with chronic periodontitis were recruited to participate in split-mouth design and provided informed consent. Subgingival plaque sampling and clinical recording at baseline, 15 days and 1 month was performed. The patients received scaling and root planing, followed by Propolis administration subgingivally in the test sites. Significant differences between test and control were evaluated using the Mann-Whitney U test and Wilcoxon rank test. 