A head unit configured to couple to a handle of an electric toothbrush, wherein the handle generates vibrational energy transferred to the head unit, the head unit including a proximal end and a distal end; a base adjacent to the proximal end, an exterior wall extending from the proximal end to the distal end, wherein the exterior wall encases a plurality of hollow chambers, wherein each of the plurality of hollow chambers are separated from one another by a scaffold, wherein the scaffold connects to the exterior wall; and a non-symmetrical bulb positioned at the distal end, wherein the non-symmetrical bulb includes a left half and a right half that are interlocked together by way of interlocking notches.