An endodontic activator is provided to facilitate the removal of pulp tissue, the smear layer, and, when present, bacteria and their related irritants from a root canal system during an endodontic procedure. The activator enhances disinfection and deep lateral cleaning of a root canal system. The activator is a sonically driven activator which is made from a strong, flexible, non-metallic, and non-cutting material. The activator can be smooth, flocked or brush-like. The activator comprises a snap-on coupler which is adapted to attach the tool to a driver via a snap on action and without the use of tools. The activator can be provided with fluid passages which allow for irrigating reagents to be delivered into or vacuumed from the root canal space during endodontic procedures. By inducing sonic vibrations in the activator, hydrodynamic phenomenon are induced in the solution in the root canal to enhance deep lateral cleaning of the root canal system of the tooth.