Electric toothbrush

An electric toothbrush including a body, a brush, and a vibration assembly assembled to the body is provided. The vibration assembly includes a power source disposed in the body, a transmission shaft, and a weight block. The transmission shaft has a first end and the second end opposite to each other. The first end connects to the power source, wherein the first end and the power source are located on a first axis. The weight block is disposed on the second end, wherein the weight block and the second end are located on a second axis. The power source drives the first end to rotate about the first axis, the second end rotates around the first axis, and so as to drive the weight block to rotate centrifugally relative to the second axis to vibrate the brush.