A dental work station is provided with two storage tanks (11, 12) mounted in parallel to each other between a distribution tank (8) connected to the water mains and a number of dental instruments (4) each storage tank (11, 12) having at least a supply outlet (14, 15) connected to distribution tank (8), and a floating shutter (18) mobile under the thrust of the water contained in storage tank (11, 12) from an open position to a closed position of supply outlet (14, 15) itself.
