Gotcha. It's just that the brush feels ultrasonic in it's frenzy :-)
Chris
On 25 Feb 2013, at 04:27, Moose <olymoose@xxxxxxxxx> wrote:
> To be clear, though, Sonicare and the other major brand (OralB?) are strictly
> sonic, ie, low frequency, not ultrasonic,
> so they will have no effect on bacterial colonies below the gum line where
> the bristles can't reach. It's ultrasonic
> waves transmitted through saliva and along the surface layers of the gum
> tissue that do that work.
--
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