Abstract: A dental tool and method for removing plaque from teeth and for cleaning teeth, as well as for other applications, wherein ultrasonic energy is coupled into a liquid stream that impinges upon the teeth to be cleaned. The ultrasonic energy cleans the teeth and removes plaque, while the liquid stream provides a carrier for the ultrasonic energy and carries away any debris produced during plaque removal or cleaning. The jet stream is a very gentle one which does not cause harm to teeth or gums and can be used in the home as well as by professionals. No discomfort is caused through heating, scraping, or abrasive action.