Refill for electric toothbrush

A refill for an electric toothbrush having a longitudinal axis, the refill having a movable brush head and being structured and configured to be attached to a handle of the electric toothbrush, the refill comprising a generally tubular structure formed by refill walls defining an interior space for accepting thereinto a coupling stem of the handle, wherein the refill includes a motion transmitter functionally connected to the brush head for driving the brush head,

• wherein the refill comprises a coupling device comprising a pair of mutually opposite cantilevered arms disposed in the interior space of the refill and adjacent to the refill walls, wherein each of the arms is resiliently deformable and terminates with a coupling surface structured and configured to engage a coupling pin extending from the coupling stem of the handle for secure and disengageable connection therewith,
• wherein the refill includes a coupling insert having a front segment comprising an upper section, a lower section, and a middle section between the upper and lower sections, wherein the lower section is separated from the middle section by a first semi-circular space and the middle section is separated from the upper section by a second semi-circular space, wherein the lower section is adjacent to the handle when the refill is attached thereto, wherein the middle section comprises the pair of mutually opposite cantilevered arms, and wherein the upper section comprises a groove structured and configured to engage an upper end of a rib longitudinally extending from a neck of the handle thereby restricting axial movement of the refill relative to the handle when the refill is being axially attached to the handle.