Abstract: The present invention relates to a toothbrush, comprising: a toothbrush body unit having a gripping handle and a head part coupled to the front end of the gripping handle; a bristle implanted in one area of the outer surface of the head part; a laser diode mounted on the gripping handle to emit a laser beam to the inside of the head part; a battery mounted on the gripping handle and electrically connected to the laser diode; a laser driving unit having a start switch installed on the gripping handle; a reflector installed within the head part to guide the laser beam emitted by the laser diode to the bristle; and a light-scattering member having a scattering body which is made of a transparent material and which has a laser passage hole with a cross-sectional area smaller than the illumination area of the laser beam emitted by the laser diode, and which is arranged in the toothbrush body unit to enable the laser beam emitted by the laser diode to pass through the laser passage hole and be scattered.