To easily remove plaques so far difficult to be removed by a conventional toothbrush by brushing by rotation of a brush stand and sterilization by medical water.

In the toothbrush main body 1, a hollow pipe-shaped water supply passage is formed toward the tip from the base end of the toothbrush main body 1, and a columnar brush stand 2 is installed on the tip of the toothbrush main body 1 so as to be freely rotatable and freely mountable and demontable, and a recessed-projecting screw surface is formed on a peripheral surface of the brush stand 2. A bristle body 3 is implanted in a conical shape in an upper surface of the brush stand 2, and on the base end of the toothbrush main body 1, the water supply passage is communicated with and connected to a faucet 6a of a service water faucet 6 through a connecting pipe 5, and the brush stand 2 is rotated by water pressure of service water.