Sereh wangi (Cymbopogon nardus L.) is a traditional plants which contains alkaloid, saphonin, pholifenol, flavonoid and essential oil. Based on previous studies had known that sereh wangi has antibacterial activity to Streptococcus mutans and Staphylococcus aureus. Antibacterial is an ideal characteristic of root canal irrigation materials. The aim of the study was to identify the antibacterial…