The photo shows that the heads of these toothbrushes are not the same. The one on the left in the photo has a rib inside that doesn't fit regular toothbrush heads. It can stick to the toothbrush, but it is very bad and takes a lot of effort to remove. Also, the bristles are incredibly soft and will not fit any Sonicare toothbrush head I've ever bought in a store. Back to Revain and 100% you should NOT buy them.
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