| http://www.w3.org/ns/prov#value | - Within various embodiments, the present invention provides oral hygiene devices, such as toothbrushes, including manual (non-motorized) toothbrushes incorporating an ultrasound transducer and an acoustic waveguide structure, power (motorized) toothbrushes incorporating an acoustic waveguide structure, and power (motorized) toothbrushes incorporating both an ultrasound transducer and an acoustic wa
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