a dentifrice dispensing electrical toothbrush using a replaceable dual - channel brush head . the dual - channel brush head has a first channel for housing a drive shaft for bristle oscillation and a second channel for dispensing the dentifrice material . the brush head is mounted on the dual - channel connector of the brush handle which contains a drive mechanism and a pumping mechanism that dispenses dentifrice material from a cartridge in the handle . a manual dispensing configuration uses an external rubber button and an electrical dispensing configuration uses a rotary solenoid for actuating an internal rubber button that applies pumping pressure to the dentifrice material . the latter benefits arthritis sufferers , as no external squeezing action is required .