Which characteristic of bacteria aids in its resistance to irrigation techniques during root canal therapy?

Biofilm formation is a primary factor contributing to bacterial resistance during root canal therapy. Biofilms are structured communities of bacteria encased in a protective extracellular matrix, making them resistant to irrigation solutions and antimicrobial agents. Bacterial motility is unrelated to resistance in root canal systems. Capsule production helps some bacteria evade the immune system but is less relevant in endodontics. Toxin secretion contributes to tissue damage but does not affect resistance to irrigation.