Buying these on Amazon kinda sucks. I didn't want to buy the knock-off brand ones (since teeth are more important than saving a few bucks) so I wanted the official Oral-B ones but many reviews mention receiving counterfeits from the official listing. I wasted so much time trying to figure out which listings and sellers were legitimate and which were counterfeit. Why is it so hard to buy an authetic Oral-B brush head on Amazon?
I finally took a leap and ordered from a seller with good feedback (Mitch Mel Corp). Thankfully I didn't get a counterfeit one. The pack of 4 I got was definitely a legit Oral-B one. The brush heads look and fit exactly the same as the one that came with my electric toothbrush (I have the Black 1000 one). I tried one and it worked perfectly.
Glad I managed to get authetic ones from Amazon. The price isn't as good as the knockoff ones but like I said, your teeth is more valuable than saving a few bucks. A little expensive but worth the price.