E. faecalis is an opportunistic pathogen that is frequently isolated from asymptomatic and persistent endodontic infections, especially from the failed root canals undergoing retreatment. 15E. faecalis is a better survivor than other root canal microbes, being able to resist various harsh conditions such as bile salts and starvation as well as many antibacterial agents. 16 The characteristics of these oral bacteria determine the antimicrobial agents that can be used for the prevention and treatment of dental diseases. In our study, aqueous extracts of 14 medicinal herbs were prepared and evaluated for their antimicrobial activities against five species of oral bacteria.