Just to clarify ...

Admin: Just to clarify, David is making the point that Sonicare is using non convention units and terminology in their promotional materials (no one writing a scientific paper would use the terms they use). And as such, there seems to be an implication that their products vibrate at a higher frequency than they do. The actual number (the actual tone that a running Sonicare creates) is around 260hz, which is Middle C on a piano.
We do the math on our How sonic toothbrushes work page.

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