A polygonal toothbrush that enables bristles to more easily enter spaces between teeth to remove plaque, and as a consequence, can have a preventive effect on periodontal disease and gingivitis, as well as a massaging effect on gums and the like. A rotating-receiving shaft of a brush material is fitted and attached to a rotating shaft provided on a handle part, and a guide plate that guides the rotation of the rotating-receiving shaft is provided on the handle part such that the friction resistance between the rotating shaft, the rotating-receiving shaft, and the guide plate can be varied or the brush material is attached, at a rotating-receiving shaft receiving hole thereof, to the rotating shaft provided on the handle part such that the friction resistance between the rotating shaft and the rotating-receiving shaft receiving hole of the brush material can be varied.
