An endodontic activator is provided to facilitate the removal of pulp tissue, the smear layer, bacteria and related irritants from a root canal system. The activator is a sonically driven activator 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 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 phenomena are induced in the solution in the root canal to enhance deep lateral cleaning of the root canal system of the tooth.