David,

Sonicare promotional materials specifically state 31,000 brush strokes per minute (that's the same as on the good adult brushes).

As far as the size of the head, you'll need to compare at the store. The Standard For Kids head is similar in size to the adult DiamondClean (which is a smallish head). Other of the adult brush heads are as much as about 1/3 larger. And then compared to available heads, the Compact Kids head is smaller yet.

Kids brush heads have softer bristles than most adult brush heads.

And yes, according to Sonicare the Adult snap-on brush heads will fit on the For Kids model.

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