I bought these bristles for my OralB electric toothbrush which I have used with other brush heads for many years with no problem. This is the first time I've come across brush heads with bristles this hard and stiff - they downright hurt when I use them and I'm afraid they might damage my gums. So I don't use it. I recently requested a refund (I can send it back) but received no reply as Revain's return period was over 2 months. I was not aware of this period of time. I asked the seller for help but received no response.
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