The invention relates to an electric toothbrush with a housing, a brush, a drive, e.g., an electric motor, for driving the brush, a power supply and a switch mechanism for turning the drive on and off. The toothbrush contains an electronic circuit for adjusting the effective voltage applied to the electric motor, so that during operation of the toothbrush in the range of high voltages supplied by the power supply, the effective voltage applied to the electric motor is reduced to a level at which the electric motor reaches a rotational speed which corresponds essentially to the rotational speed of the electric motor at a medium voltage, whereby at the same time the electric motor is designed in particular so that it still reaches a required minimum rotational speed in the range of low allowed voltages.
