Grin Pro Ultimate Gentle Care Toothbrush is designed for those with sensitive teeth or gums. This innovative brush head design features an outer circle of silver-infused 0.1mm tapered bristles that reach deeper within the gumline for a gentle yet effective clean. With an internal section of round-ended bristles to buff away bacteria from the tooth surface and create a rich lather. This is a highly dense brush head with over 4784 bristles - 100% most dense than a regular toothbrush. • 100% more bristles than a standard toothbrush • 4784 bristles • Inner Bristles: Ultra-Thin 0.1mm Round Ended Filament Fibres (creating a rich foaming lather for a luxurious clean) • Outer Bristles: 0.12mm Gum-Care Tapered Filaments (our slimmest bristles yet - To prevent gum sensitivity and ensure deep cleaning between teeth and gums. • Infused with silver for additional antibacterial properties. Shown to kill up to 99% of bacteria on the brush head, ideal to maintaining a clean brush between uses.