A dental instrument comprising:(i) a body including a container (26) having for holding abrasive particles (80), the body having a conduit (64) extending inside the container and in fluid communication with the interior of the container, the conduit including a passageway extending across the boundary of the container to its exterior at a first location, the conduit including a channel extending across the boundary of the container to its exterior at a second location, the conduit extending within the container from the first location of the container toward the second location of the container, the conduit including one opening (66) to provide fluid communication from the interior of the container into the conduit, two apertures (68) disposed between the opening and the second location of the container in fluid communication with the interior of the container；(ii) a restriction (76) formed in the conduit between the opening and the passageway, so that pressurized fluid flowing through the conduit into the container passing the restriction creates a reduced pressure adjacent the opening to draw abrasive particles from the interior of the container into the conduit: abrasive particles are entrained in the pressurized fluid flowing in the conduit toward the apertures. An amount of the particle-laden pressurized fluid flows through the apertures to the interior of the container. The remaining particle-laden pressurized fluid flows past the apertures of the conduit and exit the container.
