1. Replaceable toothbrush head assembly for an electric toothbrush having a handle portion and an output shaft for driving the toothbrush head, comprising: a portion (22) of the restriction having a hollow portion at its proximal end (24) portion (18) at the distal bristle section constriction isoedinitelny assembly (20) is disposed or which may be located inside the hollow part of the area of narrowing, the connector assembly includes at least two separate different physical positions comprises a first separate physical position in which the coupling assembly has a first physical layout, allowing node toothbrush head Brush easily removed from the output shaft or mounted on the output shaft, and a second single physical location, wherein the connector assembly has a second physical location, wherein the connector portion is in contact with the output shaft and wherein the coupling assembly is further connected with a portion of narrowing so that during operation of the electric toothbrush force of the output shaft is transferred to the node of the toothbrush head, wherein the connecting unit further comprises one of selected from the group consisting of (i) coupling element (50) in which is mounted an output shaft, and an element (26) engaging attached to the inner surface (61) of the hollow part of the area of narrowing, which makes contact with the outer surface of the coupling element, presses ipodderzhivaet planar inner surface (65) of the movable valve portion (56) connecting element, in close physical contact with the valve portion (64) of the recess ( 42) in the output shaft (39) according as the output shaft moves in1. Сменный узел головки зубной щетки для электрической зубной щетки, имеющей участок ручки и выходной вал для привода головки зубной щетки, содержащий:участок (22) сужения, имеющий полую часть на его проксимальном конце (24)участок (18) щетины на дистальном участке сужения исоединительный узел (20), расположенный или который может быть распол
