Dental-jet device and mouthpiece for a dental-jet device

A dental-jet device comprising a grip member and at least one mouthpiece, which mouthpiece is connectible to the grip member and comprises a tubular part having a fluid channel and a nozzle head mounted on the tubular part at the location of the free end of said tubular part so as to be rotatable about an axis of rotation between a central-jet position and a peripheral-jet position, which nozzle head has at least one central jet orifice and a plurality of peripheral jet orifices, a ring-shaped seal being interposed between the tubular part and the nozzle head to preclude an undesirable water discharge to the exterior of the mouthpiece, wherein the tubular part has a single tubular-part outlet which communicates with the fluid channel of the tubular part and which is off-centered from the axis of rotation of the nozzle head, the nozzle head having only two nozzle-head inlets, which are off-centered from the axis of rotation of the nozzle head and which are sealed from one another by means of a second ring-shaped seal acting between the tubular part and the nozzle head, the first nozzle-head inlet being in fluid-transmitting communication with the tubular-part outlet in the central-jet position of the nozzle head and the second nozzle-head inlet being in fluid-transmitting communication with the tubular-part outlet in the peripheral-jet position of the nozzle head and wherein the first nozzle-head inlet is in fluid-transmitting communication with the at least one central-jet orifice of the nozzle head and the second nozzle-head inlet is in fluid-transmitting communication with the peripheral-jet orifices of the nozzle head.