Eco-Dent Terradent 31 Toothbrush + Refill Medium. Description: Patented Thermo Welded Bristles. Replaceable Brush Head-Clicks in And Stays in. Safe And Secure. Lowest Bacterial Load-For Healthier Teeth And Gums. Economical. Ecological. 1. Look At The Underside of Terradent's Replacement Head. Our Unique Thermo Welded Technology Fuses Together Each individual Bristle, Creating A Solid Head. Thermo Welding Eliminates Spaces Between The Bristles Where Harmful Bacteria Hide And Breed. Your Bacteria-Laden Toothbrush Can Spread Harmful Bacteria To All Parts of Your Mouth. in Tests Conducted At A Leading Dental School, Terradent Demonstrated The Lowest Bacterial Load of All Brands Tested. 2. Replaceable Toothbrush Head For Your Hygiene, Budget, And Your Planet. Replacing Your Recyclable Head Reduces Plastic Use Up To 95% Vs Other Brands - Even Recyclable Ones. Only Terradent Meets All 3 Environmental Imperatives: Reduce, Reuse, And Recycle. 3. Terradent Has The Highest Percentage of Dentist-Preferred Rounded Bristles of All Brands Tested At A Major Dental School. Vario-Length Bristles Clean All Tooth Surfaces Better, including Between Teeth And At The Gum Line. 4. Compact 31-Tuft Head For Easy Access To Back Teeth, inside And Out, Without Gagging. 5. Flexible Neck Distributes Brushing Pressure Better To Protect Gums, Ergonomic Handle Provides For Better Grip And Brush Control. Disclaimer: These StateMen's Have Not Been Evaluated By The Fda. These Products Are Not intended To Diagnose, Treat, Cure, Or Prevent Any Disease.