An electric toothbrush includes a toothbrush head and a toothbrush handle detachably coupled to each other. The toothbrush head includes a first outlet, the toothbrush handle includes an accommodation space in which a control circuitry, a connection device, a toothpaste chamber and a power generation device are provided, and the connection device is hollow. The toothpaste chamber includes a second outlet and an accommodation cavity for accommodating a toothpaste bottle provided with a first chip, first serial number information about the toothpaste bottle is stored in the first chip, the second outlet is in communication with the first outlet through the connection device, and the toothpaste chamber is provided with a first reader. The power generation device is electrically coupled to the control circuitry, and configured to enable toothpaste in the toothpaste bottle to pass through the second outlet, the connection device and the first outlet to the toothbrush head.