PRIMALS Horse Bristle Electric Toothbrush Replacement Heads (4 Pack)

Every plastic replacement head on the market uses nylon bristles derived from petroleum. Nylon bristles shed up to 3,000 microplastic particles per use, and those particles absorb directly through your gums into your bloodstream. A 2025 PubMed-backed study confirmed that plastic toothbrushes release up to 2.3 million microplastic particles per year.

Here is the proof: https://www.sciencedirect.com/science/article/pii/S0147651325010395

These plastic heads also contain BPA, phthalates, and PFAS that leach into your mouth with every brush. Under high-frequency sonic vibration, that chemical leaching accelerates even further. You're replacing your brush heads every few months, but every new head is just more plastic, more nylon, and more microplastics against your gums.

PRIMALS Horse Bristle Replacement Heads are the world's first natural-bristle replacement heads designed specifically for sensitive gums. Instead of petroleum-based nylon on a plastic base, we use:

• 100% Pure Horse Hair Bristles (the softest natural bristle available)
• 100% Bamboo Head Base
• 100% Plastic & Nylon Free
• 100% BPA, Phthalate & PFAS Free
• 100% Glue Free (bristles are hand-woven, not glued)
• 100% Naturally Antimicrobial

Compatible with the PRIMALS Electric Toothbrush and all Philips Sonicare click-on handles. Keep your handle, ditch the plastic bristles.

• Eliminates 2.3 million microplastic particles per year from your brushing routine
• The softest natural bristle available for sensitive gums, receding gumlines, and delicate enamel
• Protects your hormone health with zero BPA, phthalates, or PFAS touching your gums
• Supports gut health by eliminating daily microplastic ingestion
• Naturally antimicrobial bristles that resist bacteria and mold between uses
• Zero toxic glue or synthetic adhesives holding your bristles in place
• Hand-woven into a bamboo base with nothing artificial touching your mouth
• Compatible with your existing PRIMALS or Sonicare click-on handle
• Replaceable with boar bristle heads for a firmer, deeper clean

• 4x Horse Bristle & Bamboo Replacement Heads

Each head is individually designed to click onto the PRIMALS Electric Toothbrush handle and all compatible Philips Sonicare click-on handles. No adapters needed, just click on and brush.

Yes. Both fit the same handle and click on the same way.

Our Horse Bristle Heads are the softest natural bristle available. Perfect for sensitive gums, receding gumlines, or anyone who prefers a gentler brushing experience. The horse hair flexes with your gums instead of scraping against them.

Our Boar Bristle Heads are firm for a deep, powerful clean. Ideal if you prefer a thorough scrub that digs into plaque and buildup.

Both are 100% natural, plastic-free, glue-free, and antimicrobial. Simply a matter of whether you prefer softer or firmer bristles.

Designed for PRIMALS:
Compatible with the PRIMALS Boar Bristle Electric Toothbrush and PRIMALS Horse Bristle Electric Toothbrush.

Also compatible with all Philips Sonicare click-on handles:
- Protective Clean (4100, 4300, 5100, 5300, 6100, 6500)
- Expert Clean (7300, 7500)
- 9900 Prestige
- Diamond Clean (Smart, Classic, 9000)
- Healthy White / Healthy White+
- Flex Care / Flex Care+ / Flex Care Platinum
- 2 Series Plaque Control / 3 Series Gum Health
- Easy Clean / Daily Clean / Simply Clean
- HydroClean / PowerUp
- Sonicare Kids
- Elite+
- 1100 / 2100 / 3100 Power Toothbrush

Not compatible with:
- Philips One handles
- Philips Screw-on handles
- Non-click-on electric toothbrush handles

How to check: If your current Sonicare brush head clicks onto the metal drive shaft without twisting, your handle is compatible. Also see the image titled "Replacement Head Compatibility" in the product images for more info.

If you own any brand or model of electric toothbrushes outside of the ones explicitly mentioned above - we highly recommend that you purchase PRIMALS Boar Bristle Electric Toothbrush or PRIMALS Horse Bristle Electric Toothbrush to ensure compatibility, and for the best microplastic-free and low-EMF sonic brushing experience. Each PRIMALS Electric Toothbrush comes with 2 FREE Replacement Heads.

To inquire about compatibility for any brands or model not mentioned above, please email our 24/7 support team at lauryn@primals.shop or call us at (808) 201-1549 Monday–Sunday, 9AM–5PM EST before purchasing as we are unable to accept returns for purchases made for models we have not explicitly confirmed compatibility with.

PRIMALS is not affiliated with or endorsed by Philips or Philips Sonicare. Compatibility is based on handle design only.

Compatible Philips Sonicare Model Numbers (Click-On System):

- For 2 Series Plaque Control: HX6250 HX6240 HX6210 HX6211 HX6213 HX6220 hx6229-75 HX6231 HX6234 HX6235 HX6263 HX6275 HX9034 HX9023

- For DiamondClean (Smart): HX9031 HX9048 HX9150 HX9312 HX9322 HX9331 HX9332 HX9340 HX9342 HX9350 HX9351 HX9352 HX9359 HX9361 HX9362 HX9370 HX9371 HX9372 HX9381 HX9382 HX9392 HX9393 HX939w HX939b HX939v HX9500 HX9610 HX9690 HX960u HX962k HX962v HX939p HX9900 HX991r HX993w HX992b HX993b HX992w HX991p HX992p HX992x HX993l HX9903 HX9924 HX9954 HX99r1

- For ProtectiveClean: HX4100 HX4300 4500 HX4700 HX4900 HX5100 HX6100 HX681a HX682p HX682x HX685t HX681u HX684a HX6810 HX685j HX684b HX686w HX681j HX6160 HX6160d HX6150 HX642a HX642c HX6481 HX6810 HX6817 HX6857 HX686p HX686w HX6871 HX6876 HX6877 HX6160 HX6150 HX6110

- For 3 Series Gum Health: HX6610 HX6616 HX6620 HX6631 HX6632

- For HealthyWhite, for HealthyWhite+: HX6314 HX6710 HX6711 HX6720 HX6721 HX6722 HX6730 HX6731 HX6732 HX6733 HX6750 HX6760 HX6761 HX6780 HX6781 HX6782 HX8911 HX8910 HX8918 HX8923 HX8962 HX8982

- For FlexCare+, for FlexCare Platinum: HX6014 HX 6012 HX6051 HX6150 HX6160 HX6902 HX6910 HX6911 HX6920 HX6921 HX6922 HX6930 HX6932 hx6942/20 HX6950 HX6960 HX6963 HX6964 HX6970 HX6980 HX6972 HX6973 HX6992 HX6995 HX9111 HX9112 HX9120 HX9140 HX9150 HX9160 HX9171 HX9172 HX9191 HX9192 HX9195 HX6160 HX9180

- For EasyClean: HX6500 HX6510 HX6511 HX6512 HX6520 HX6530 HX6552 HX6581 HX6582

- For PowerUp and for DailyClean: HX3100 HX3110 HX3120 HX3130 HX3231b HX3300 HX3610 HX3631 HX3650 HX3210b HX3220b HX3404 HX3411 HX3211 HX3217 HX369ab HX369w1 HX369bk HX369dp HX360cb HX366w2 HX364w3 HX368w HX3702 HX3724

- For Sonicare Kids: HX6304 HX6042/94 HX6311 HX6312 HX6320 HX6321 HX6322 HX6329 HX6330 HX6340 HX6341 HX6343 HX6345 HX6350 HX6351 HX6352

- For Elite+: HX3211 HX3281 HX3201 HX3213 HX3216 HX3222 HX3226 HX3231 HX3241 HX3250 HX3260 HX3260b HX3561 HX3701 HX3734

- For Expert Clean, for Simply Clean: 7500 7400 7300 HX751g 2100

- Other: HX3410ag HX3300 HX3230b HX3681/23

We recommend replacing your brush head every 1 to 3 months for optimal hygiene, or sooner if:

• Bristles appear frayed, bent, or worn
• Bristles are no longer soft and flexible
• You notice reduced cleaning effectiveness
• Bristle loss or split bristle bundles appear

Subscribe for automatic delivery on your schedule so you always have fresh natural bristle heads right to your door.

• In your first few uses, a small number of bristles may naturally shed as the bamboo adjusts to your local humidity. This is completely normal and typically stops after 1 to 2 weeks of regular use. If excessive shedding occurs, contact us at lauryn@primals.shop.
• Leave a 0.5 to 1mm gap between the brush head and handle for proper vibration transfer. Do not force the head flush against the handle.
• Stand your toothbrush upright after each use for optimal drying to maximize the lifespan of each head.
• Horse bristles are already ultra-soft but can be softened even further by running under warm water before use.
• If bristles are flattening quickly, you may be brushing with too much force. Horse bristles are designed to flex with your gums, not scrape against them. Use gentle pressure.
• Replace every 1 to 3 months for optimal hygiene. Subscribe for automatic delivery so you never go back to plastic.
• For a firmer, deeper clean, try our Boar Bristle Replacement Heads.