No, it doesn't appear so. It seems the bristles do wear out somehow, to me it appears that they simply become less stiff over time. The change to a new brush he

No, it doesn't appear so. It seems the bristles do wear out somehow, to me it appears that they simply become less stiff over time. The change to a new brush head is noticeable. This should be relatively easy to verify. One could take a new brush head and forward its counter to the limit, directly comparing it to a new unmodified brush.