Abstract: Disclosed is an improved apparatus for delivery of pressurized particulate matter against a surface or target to abrade, etch, erase, cut, penetrate, smooth, clean, polish and/or harden the surface or target. The most important use to which the present invention is adapted is use by dentists and oral hygienists to very effectively clean teeth, employing a particulate matter such as aluminum oxide, while at the same time having no effect on soft tissue such as the gums. This is accomplished using a prefilled, sealed, and disposable fluidizing chamber and cannula assembly that avoids contamination and which has already been approved by the FDA for dental use. Included is a fluidizing chamber having a discharge end of an inlet tube that is disposed below or overlaps the intake end of the cannula such that the discharge of the inlet tube blows the particulate matter into the fluid above the intake end of the cannula, thereby suspending it therein, without clogging.