Value pack of 4. ADA Accepted - American Dental Association Non Toxic Choose Your Toothbrush Fits any RADIUS® Big Brush & Source™ Brush Better by Design™ Plant Based Inks Water Based Coating 100% Toxin Free Low Energy Machines Wide, Gum Massaging Design Soft Bio-Plastic Bristles Long Neck For Deeper Clean Removes Plaque & Tarter Cruelty-Free Women Owned™ Replace, Refresh, Reduce Swap this head out for your worn-out one. Special bristles clean teeth and gums better. Replacing heads instead of throwing a brush away reduces plastic consumption and waste by 93% If everyone in the world switched to Source, 4 billion less toothbrushes a year would end up in landfills Green by design: Saves 93% of brush normally throw into landfills. Bioplastic Bristles Toothbrush Tip: This brush has 3500 bristles (compared to 1800 bristles for other brushes) for a deeper, more complete clean. All RADIUS heads are interchangeable.