The lowest MIC of 3.125 mg/ml observed in the case of Curcuma longa. As for MBC, concentrations below 12.5 mg/ml for any of the samples had no bactericidal effects on S. mutans. T. indica and C. longa has an MBC value of 12.5 mg/ml however, A. indica bark and M. charantia has no MBC effect beside the crude extract.