Not so with the Denman D3: Because it has no knobs, they can not be lost as well. But that's not all what makes this brush more. What one learns neither the manufacturer's website or in the product description: The brush is completely dismantled. The rubber pad together bristles can be completely pushed out of the brush body. Then, the cushion can be flipped open and you can also take out the bristles. Namely, all the bristles of a series with a comb-shaped structure connected that you pull for cleaning from the pillow and later simply can reconnect. So you really get every hair and every dirt residue from the brush. In addition, you can use this feature even to some "thin out" the relatively densely packed bristles when needed.
However, a disadvantage of this design should not be overlooked: Normally the rubber pad keeps very well in the brush. But when it is wet, the water acts as a lubricant. Then the pillows can fairly easily slide out, and it could well happen that suddenly together bristles hanging at loggerheads when through brush. It would have been better to incorporate some type lock.
What should also be noted yet: The brush is a little stiff and may have some scratch on the scalp in thin hair, but not as cheap as a brush with broken knobs.
