We're not entirely familiar with the nomemclature "Oral B Type3756". When we Google that phrase, what comes up is pictures and Oral B model names that all seem to be associated with just the regular (rotating) Oral B models.

The end of the Pulsonic (a discontinued model) has a comparatively large plastic tip that the brush head fits over.
The rotating Oral B handle's have a slender metallic rod sticking out.

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