Electric toothbrush

An electric toothbrush is a toothbrush which automatically creates rapid bristle movements using oscillation motions to imitate hand brushing.

Electric toothbrushes can be classified according to the frequency of their movements as power, sonic, or ultrasonic toothbrushes, depending on whether they make movements below, in, or above the audible range, respectively.

An electric motor is used to produce motions at sonic speeds or below. A piezoelectric crystal is used for ultrasonic motions in ultrasonic toothbrushes. Later model electric toothbrushes are typically using an alternating current (AC) power cord to deliver power to a charging base that charges a direct current (DC) rechargeable battery using inductive charging technology, or it's a standalone unit powered by insertable standard size batteries like AA or AAA.

Many later models incorporate features like timers, pressure sensors with multiple cleaning modes, WiFi and Bluetooth.