Abstract: A dental abrasive blasting or jet apparatus is provided with an interconnected handpiece having a nozzle arrangement which is supplied with a dental powder as stored in a powder reservoir and delivered under pressure by a gaseous carrier medium via a powder supply line together with a fluid that is supplied via a separate fluid supply line. The apparatus is provided with a separate fluid receptacle or bottle which is filled with a flushing or rinsing liquid for being selectively supplied to the nozzle arrangement of the handpiece via a branch line having a change-over directional valve downstream of a suction pump for supplying the flushing or rinsing liquid to the portion of the fluid supply line that is directly connected with the handpiece.