Well firstly it works on my toothbrush. They spin, they clean, they work. The problem is they are so tight I have to force them onto the appliance and then use a strongman to pull them off to rinse and brush them. This resulted in the round brush separating from the rest of the body and the brush block pinching my lip and gums during use. All four are the same in the sense that they are so tight that it is very difficult to remove them without damaging them. Wouldn't do it again.
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