An electric toothbrush comprises a toothbrush handle (1), a toothbrush rod (2) and a toothbrush head. The toothbrush head comprises a left-rotating hairbrush and a right-rotating hairbrush (3, 3′), which are oppositely and rotatably fixed on a toothbrush shaft (4). The right end of the toothbrush shall (4) is arranged in a shaft hole at the upper end of the toothbrush rod (2) and is axially positioned on the shaft hole through the right-rotating hairbrush (3′) and a shaft cap arranged at the right end of the toothbrush shaft (4) and the bristles of each of the left-rotating hairbrush and the right-rotating hairbrush (3, 3′) comprise an inner ring of bristles and an outer ring of bristles (6, 6′, 7, 7′).
