After the removal of the plaque the surfaces are thoroughly and gently polished using high-pressure water and pulverized salt. In the course of the procedure the fresh aroma flavoured air/bicarbonate mixture is blown on the tooth surface in the form of a watery spray. The sandblaster is harmless to the hard tissue of the teeth and it very precisely eliminates all deposits and discolouring even from the inaccessible interdental spaces. With this procedure any external discolouring caused by smoking, red wine, coffee, tea, or drugs of iron or nitrate content can be quickly and easily removed. It polishes the teeth and the result is a totally smooth surface.