TOOTHBRUSH

A toothbrush includes a main body that includes a head portion with a bristle raising surface on which bristles are provided in a standing manner, a grip portion, and a neck portion. A light emission portion that emits light through a specific region of the bristle raising surface toward a tooth surface and a light reception portion that receives radiated light from the tooth surface resulting from the light, through the specific region, are provided inside of the main body. It is determined whether or not there is dental plaque on the tooth surface based on the output of the light reception portion. A light reception and condensing portion that condenses the radiated light from the tooth surface toward the light reception surface of the light reception portion is arranged in the housing portion forming the specific region.