| 摘要 |
A toothbrush includes a handle and a head secured to each other. A spindle and a shaft are rotatably supported in the handle. Two rods for carrying bristle are rotatably supported in the head and fixed to the spindle and the shaft. Two gears are secured on the spindle and the shaft and meshed with each other. A motor is coupled to the spindle for rotating the spindle and the shaft. The rods are rotated reversely by the motor via the gears. A cover is pivotally coupled to the head for opening the head in order to replace the bristle.
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