A personal care appliance (10), or power toothbrush, comprises a handle (16) including a drive train (20), a motor controller (18), and an attachment (12) that includes a resonant structure (14). The motor controller (18) controls an operation of the drive train (20) to produce at least one of a first mechanical stimulus and a second mechanical stimulus, the first mechanical stimulus comprising a first cleaning motion (42) having a first resonant frequency, the second mechanical stimulus comprising a second movement having a second resonant frequency. The resonant structure (14) implements the first cleaning motion (42) and an additional resonant motion (44,46,48,50,52,60) as well as the cleaning motion (42).
