Brush intensity settings -

Here's a link to a publication from the branch of Philips Sonicare in Germany. It discusses the modes of a Flexcare brush and how changing their intensity settings affects them.

On the Healthywhite, Clean and Clean/White will both involve a 31,000 strokes/min action.
With the 3 Series, according to the publication, using it on the middle intensity setting should be similar to Sensitive mode on the Healthywhite.

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