The main objective in Endodontics is to obtain a correct and maximum decontamination throughout the whole system of root canals. In spite of all the efforts, none of the teeth with root canal treatments are 100% free of microorganisms and they can run the risk of undergoing secondary or persistent infections...El objetivo principal de la endodoncia es la descontaminación completa del sistema de conductos radiculares. A pesar de todo el esfuerzo, ningún diente endodoncicamente tratado es 100% libre de microorganismos y puede correr el riesgo de infecciones secundarias o persistentes...