Abstract: A fluid driven toothbrush includes: a brush-mounting shank defining a fluid channel and a disc-receiving chamber that is in fluid communication with the fluid channel and that is defined by a chamber-defining surface; and a brush head including a disc that extends axially and rotatably into the disc-receiving chamber and that is rotatable about a rotation axis. The brush head further includes a plurality of angularly disposed vanes centered at the rotation axis, protruding axially from the disc, and disposed in the disc-receiving chamber. Each of the vanes has a free end face in sliding contact with the chamber-defining surface of the disc-receiving chamber. The fluid channel has a curved discharging end section extending in a tangential direction relative to the disc so as to generate a tangential flow in the disc-receiving chamber.