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The point is not that there are only counterfeits, but that your chance of getting one is much higher due to mixed supply

The Chinese have gotten much better with the Oral B toothbrush head counterfeits.

I bought some on eBay, advertised as genuine but not. The packaging was near perfect. The only thing that gave them away was the different mouth-feel and two misplaced mold release marks.

Genuine Braun dual-action brushheads have two divits on top of the brushhead. The copies have the two divits on the side.

I sent a note to the seller warning him that some counterfeits might have gotten into his supply. Seller refunded me.

If you get counterfeits from Amazon I am sure the 3rd party seller will refund you.

Have you bought them?

I’ve bought both the brand name and cheaper knockoff Oral-B electric toothbrush heads. Haven’t been able to distinguish them yet in terms of quality and performance. YMMV.