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Big Brush Toothbrush Replacement Heads

Upgrade your brushing routine and dramatically cut waste with RADIUS Big Brush replacement heads. Featuring a supersized, gum-massaging head and an impressive 6,000 plant-based bristles, these refills deliver a  MOUTHBRUSH experience that gently polishes, protects, and pampers your entire mouth.   These are replacement heads only. A Big Brush or compatible RADIUS
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Supersized brush head for full-mouth coverage
Replacing only the head reduces waste by 93%
6000 soft, plant-based bristles for a deeper, more complete clean
Massages gum to prevent recession & bleeding

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  • Estimated Delivery:Jun 14 - Jun 18

  • Free USA Shipping: On all orders over $35

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Benefits

These replacement heads are what give the Big Brush its supersized cleaning power.. With 6000 ultra-soft, plant-based bristles (compared to just 1800 in most standard brushes), the oversized head gently massages gums and helps to prevent recession. The large head evenly distributes pressure over a larger area, helping to reduce bleeding gums and protecting enamel from overbrushing.

The Big Brush head sits naturally at a 45º angle, allowing effortless plaque removal along the gumline.

Additional performance benefits:

  • 300% more bristles for a fuller clean
  • Larger surface area = faster, more effective brushing
  • Helps reduce enamel erosion
  • Bristles last up to 3× longer than conventional toothbrushes
  • All RADIUS replaceable heads fit all RADIUS replaceable handles

Materials

  • Plant-Based Nylon Bristles
  • Head base made from Nylon + EcoPure® (supports biodegradation in landfill conditions)
  • Packaging made from Recycled PET (soda bottles) + recycled cardboard
  • BPA-free
  • PFAS-free

Sustainability

Reduce your brushing footprint by replacing only the brush head - not the entire toothbrush. These Big Brush replacement heads reduce plastic waste by 93%, helping you avoid tossing full brushes into landfills.

Sustainability features include:

  • EcoPure® additive supports biodegradation
  • Recycled + recyclable packaging
  • Long-lasting bristles mean fewer replacements
  • An interchangeable system extends the handle’s life
  • ADA Accepted performance with eco-forward design

A smarter system for your oral health - and the planet’s.

30-Day Guarantee

We stand behind every RADIUS product. If you don’t fall in love within 30 days, return it for a full refund, no questions asked.

Shipping Info

All orders ship in recyclable packaging. Free U.S. shipping on orders $30+. Learn more in our Shipping Policy.

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FAQs Reviews

More Amazing Details

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Supersized, gum massaging design.

The wide oval brush head is designed to improve gum health and can even reduce the risk of gum and heart disease by massaging the whole mouth — leaving you with that tingly-fresh feeling. It’s like a trip to the dentist, every day and night. Pair these replacement heads with our Big Brush™ or our Source™ Brush.

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A longer lasting brush.

These brushes are designed to last longer than the average toothbrush. That means you get a better cleaning and create less waste.

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Replacement Head for reduced waste

By using a Replacement Head, 90 out of every 100 toothbrushes escape the fate of the landfills. Your forever handle is made from renewable timber and designed to last. Help us turn the tide on the plastic epidemic that litters our fields and clogs our oceans.

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Frequently Asked Questions

Answers to common questions to help you understand things better.

Can toothbrush heads be recycled?

No - all toothbrush heads contain metal staples that make recycling impossible. RADIUS includes EcoPure® to support biodegradation in landfill settings.

How do I remove or replace a Big Brush head?

Pull the head straight off without twisting. If tight, run under warm water for 30–60 seconds. Avoid tools like pliers, which can damage the handle.

How often should I replace my brush head?

Every 3–6 months, or sooner if bristles fray. RADIUS heads last up to 3× longer than typical brushes

Do you offer smaller heads?

Yes. If the Big Brush head feels too large, try the Source™ head - it’s 50% smaller and fits the same handle.

Are all RADIUS heads interchangeable?

Yes - all RADIUS replacement heads fit all RADIUS handles: Source™, TOUR™, and Big Brush™.