Chlorhexidine at concentrations below 2% is generally ineffective against Enterococcus faecalis, a resilient microbe commonly linked to root canal treatment failures. For optimal antimicrobial action, 2% CHX requires a minimum contact time of 5 minutes. In contrast, high-concentration sodium hypochlorite such as 5.25 % —used undiluted and under rubber dam isolation—has shown superior efficacy in eliminating endodontic pathogens. ————————————————————————— ‎کلرهگزیدین با غلظت کمتر از ۲٪ معمولاً عل