Heads need replacing every few months, the genuine multipacks are priced like printer ink, and the marketplace offers look identical in the photo. This is the counterfeiters' favorite arithmetic, and dental forums are full of people who ran the experiment so you do not have to.
The differences are small in the hand and large over three months of twice daily use, which is exactly the profile of a product where the copy wins the sale and loses slowly.
Bristle quality is the invisible line item: end rounded filaments that are gentle on enamel and gums, tuft retention tested so bristles stay in the head rather than the mouth, and indicator bristles that fade on a schedule matched to the replacement interval. The coupling is engineered too: the head clicks onto the handle's metal shaft with a fit that transmits oscillation without chatter, because a loose head wastes the motion you paid for and rattles through the brush.
Counterfeits cut each of these in ways a listing photo cannot show. Filaments with sharp, unrounded ends, tufts that loosen within weeks, and fit that varies head to head inside the same multipack.
Plenty of legitimate third party heads are sold openly as compatible, under their own brands, at lower prices, and some perform respectably. The honest comparison is between those and the genuine article, with the generic's own reviews and return policy. The counterfeit removes the choice: it uses the genuine brand's name, packaging, and sometimes copied review counts, charging near genuine prices for generic or worse quality, which is why it outearns honest generics and why enforcement prioritizes it.
One more practical test costs nothing: run one head from a new pack for two weeks and inspect it against the reference head under your phone's macro mode. Fraying, splayed outer tufts, or a neck that has developed play on the shaft inside a fortnight settles the question faster than any packaging debate. Read listings for the tell: brand name in the title but 'compatible' hedges in the fine print, seller names unrelated to any dental brand, and pack quantities the genuine line does not sell.
Buy heads from the manufacturer's store, a pharmacy, or an authorized retailer, and keep one genuine head as your reference: weight, print sharpness on the neck, the click of the fit. When a new pack deviates on all three, stop at the first head rather than using the pack out of optimism. Report the listing with photos side by side; in this category the platform evidence standard is easy to meet because the differences photograph well at macro distance.
Compare with a known genuine head: print quality on the neck, bristle evenness and end rounding under magnification, and the fit's click on the handle. Loose fit, ragged bristles, and blurry print together mean counterfeit.
Reputable generics sold under their own brands are a legitimate choice many people use happily. The risk concentrates in counterfeits imitating the genuine brand, where materials and tuft anchoring are unaccountable.
Tuft anchoring is a manufacturing step counterfeiters rush. Bristles that loosen or shed within weeks, far short of the normal three month life, are one of the most reported signs of a fake head.
Yes. Platforms act on this category because the reports are easy to verify and the sellers move volume. Side by side photos of your genuine and fake heads make the case in one image.