One aspect of the present invention relates to an electric toothbrush in which an LED unit is mounted to perform oral sterilization and tooth whitening treatment during the brushing of the teeth, and further relates to a toothbrush bristle assembly for the electric toothbrush. The electric toothbrush according to one embodiment of the present invention comprises: a toothbrush bristle assembly including a handle having a vibrator, and a coupling space into which the vibrator is coupled. The toothbrush bristle assembly comprises: a toothbrush bristle body having a brush an LED unit mounted on the toothbrush bristle body to perform oral sterilization and tooth whitening treatment and a connector module having a first connector arranged in the toothbrush bristle body to interconnect the LED unit and a driving power source, as well as a second connector arranged in the vibrator.
