| http://www.w3.org/ns/prov#value | - Apparatus 10 includes a nozzle/standoff member 12 which is designed to be positioned against the teeth, particularly the interproximal area, to provide a desired spacing between the piezoelectric transducer 16, which produces a range of ultrasound frequencies, and the teeth, specifically to maintain the teeth at or near the focus of the transducer.
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