An electric toothbrush is a powered dental hygiene device that uses a rotating, oscillating, or high-frequency vibrating head to clean teeth more effectively than manual brushing. It is used to remove plaque, reduce gingivitis, and improve gum health. Users guide the brush along the teeth and gum line, allowing the motor to provide the cleaning action, often with the help of features like built-in timers to ensure a full two-minute brushing time.