Abstract: An electronic toothbrush including a toothbrush head assembly extending in an axial direction. The toothbrush head assembly has a toothbrush head supporting a plurality of bristles oriented in a direction transverse to the axial direction. A motor cup assembly includes a motor cup and a shaft member extending into a neck portion of the toothbrush head assembly. An electric vibration motor is secured by the motor cup. A handle housing circumscribes the motor cup, a chassis structure and control electronics. A gimbal arrangement includes a gimbal pin oriented substantially perpendicular to the axial direction and received by the chassis structure. The gimbal arrangement constrains vibrational displacement of the shaft member arising from vibrational energy produced by the electric vibration motor to within a plane substantially normal to a longitudinal axis of the gimbal pin. The shaft member causes the toothbrush head assembly to be displaced within the plane.