brushing intensity

Is there a relationship between "sensitive" mode on some brushes and low or medium "intensity" on Series 3. Fewer strokes/min? Also, please confirm that only "clean" mode, i.e. full bore 31,000 strokes /min, accomplishes the "fluid dynamic" cleaning - or does sensitive &/or med/low intensity just have less?? My concern centers around abrasive notching of the root surface. Does any particular brush head facilitate fluid dynamic cleaning? Intercare? Thanks

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