[gnabgib]

The co-branding is because the device (electronics) are Braun, and the bristles/brush-heads are Oral-B.

[Reason077]

Well, yes, but both the toothbrushes and the brush heads are sold only with the "Oral-B" name in most countries. That is: Braun logo still appears on the device, but not in the product name, box, and marketing materials.