Abstract: A dental handpiece includes a bur sleeve that detachably holds a dental treatment tool and a head portion configured to rotationally drives the bur sleeve about a central axis of a dental treatment tool. The bur sleeve is rotatably supported in a housing of the head portion via a rolling bearing. The rolling bearing includes an inner ring that supports the bur sleeve, an outer ring that is fixed to the housing, and a plurality of rolling elements disposed between the inner ring and the outer ring. A flow path of a cooling medium that communicates in an axial direction is provided on an outer circumferential surface of the outer ring or inside the outer ring.

Abstract: Two nozzles 37 in pair are provided along an inner circumferential surface 21a of a concavity 21, air is blown out in a space from a blowout hole 37a provided at a tip end portion of the nozzle from a side where the nozzle 37 is provided aiming at an opposite side along an inner circumferential surface of the space and a powder contained in the concavity 21 is caused to rise up in the space, whereby the condition of the powder mixed with the air within the space is improved.

Abstract: Two nozzles 37 in pair are provided along an inner circumferential surface 21a of a concavity 21, air is blown out in a space from a blowout hole 37a provided at a tip end portion of the nozzle from a side where the nozzle 37 is provided aiming at an opposite side along an inner circumferential surface of the space and a powder contained in the concavity 21 is caused to rise up in the space, whereby the condition of the powder mixed with the air within the space is improved.