The oral care appliance comprises: a fluid pump (46); a source of liquid (50); and a source of gas (12); wherein the pump is in operative communication with the sources of liquid and gas to produce a series of gas-injected fluid pulses and/or a jet fluid flow using liquid slugs in a selected sequence directed to a nozzle and from there to the teeth, and a control assembly for selecting pulse flow or slug flow with specific set times and sequence directed to a nozzle assembly (80) and from there to the teeth; wherein the pulses have a pulse width within the range of 0.001-0.5 seconds, a pulse height from 0.1-10 Newtons, a rise/fall time range of 0.5-250 ms, a repetition rate in the range of 2 Hz to 20 Hz, and wherein the gas/liquid mixture range from 40-95% volume to volume gas to liquid, or wherein the fluid slugs in the jet flow have a volume in the range of 0.05-0.5 ml per orifice, a diameter in the range of 0.1-2 mm and a repetition rate within the range of 2 Hz to 20 Hz.