To provide a dental instrument that can be connected to existing operational units, such as dental units and table-top devices, in order to allow dental polishing procedures, an embodiment of the present invention is directed to a dental polishing device (1) comprising a powder chamber (2) for holding abrasive powder. The powder chamber (2) comprises an inlet (5) and an outlet (6) arranged to be brought in fluid communication with an operational unit (11) for controlling a supply of pressurized air through the powder chamber (2) to a hand-held instrument (3) connectable to the outlet (6) of the powder chamber (2) through a hose (4). The dental polishing device (1) comprises a connection mechanism and is arranged to be fixedly but detachably connected external to the operational unit (11) through the connection mechanism.