the invention is directed to a brush attachment adapted to be attached to and detached from a shaft of a handle of an electric toothbrush , including a bristle area , a brush shank and a plug - on part disposed in the brush shank , wherein the plug - on part includes a first spring element and a second spring element which act on the shaft when the brush attachment is plugged onto the shaft . this establishes a connection without play between the brush attachment and the shaft , enabling relatively high vibration frequencies to be transmitted .