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If you own a Sonicare, you do not need to replace the whole brush to go natural. The handle is the expensive, durable part, and it is fine. The only thing worth changing is the plastic head that clicks onto it. Here is what that head actually is. The bristles are nylon, which is plastic, and a nylon head sheds around 2.3 million microplastic particles a year into your mouth (PMID: 40680448), sped up by the sonic vibration. The housing can carry BPA and phthalates. You replace it every few months and restart the same exposure, on a handle that works perfectly well. This is the natural upgrade for that head. It clicks onto all Sonicare click-on handles with no twisting, so there is no new device to buy and nothing to relearn. PRIMALS is not affiliated with or endorsed by Philips or Philips Sonicare. Compatibility is based on handle design only. Here's the mechanism: real horse bristle is a natural fiber, not a polymer, so there is nothing to shed, and it is the softest natural bristle available, gentle enough for sensitive and receding gums. You keep the sonic power of your Sonicare and lose the plastic, all by swapping one part. The PRIMALS Horse Bristle Electric Toothbrush Replacement Heads click right onto your existing handle. ✅ Clicks on with no twisting, fits all Sonicare click-on handles ✅ Skip buying a new device, keep the handle you already own ✅ 100% natural horse bristles, the softest bristle, gentle on sensitive gums ✅ Zero nylon, zero microplastic shedding, and no BPA, phthalates, PFAS, or toxic glue ✅ Naturally antimicrobial and biodegradable, with a subscribe option so you never run out What makes it different: every other replacement head is plastic and nylon, and switching to natural usually means buying a whole new brush. PRIMALS clicks onto the Sonicare handle you already own, in the softest natural bristle, so going plastic-free costs you nothing but the head. Best Value: 4-Pack Replacement Heads 🤝 Subscribe and never run out 🤝 Free shipping Hundreds of clinicians share PRIMALS with their patients. Over 100,000 people already trust PRIMALS for toxin-free brushing. We ship from California, so it arrives fast. Keep your handle, upgrade your head. Click "Shop now" to go plastic-free.