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In any electric toothbrush there is an electric motor and a battery inside the handle. When you use the on/off switch to connect the motor to the battery, the motor spins very fast and drives some gears which turn the brush head backwards and forwards to clean your teeth.
Some electric toothbrushes have replaceable batteries which means that, when the battery runs down so that the motor won't run, you have to take out the old battery and put in a new one.
If the toothbrush is the kind that is rechargeable, it has a battery which does not have to be removed and replaced by a new one. Instead, you place the handle onto a charger unit and when that is plugged into a home ac power socket it re-charges the battery.
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