Enjoy healthier teeth gums and general health with our antibacterial nanosilver toothbrush. This advanced toothbrush: Reduces Bacteria. 99.9% Reduction in Bacteria with Nano-Silver Bristles. Nanotechnology is a rapidly growing science of producing and utilizing nano-sized particles that measure in nanometers (1nm = 1 billionth of a meter). Nano-silver is making an early impact in healthcare. Silver has been used for the treatment of medical ailments for over 100 years due to its natural antibacterial and anti-fungal properties. Nano-silver particles typically measure 25nm. Because of their nano-size they provide an extremely large relative surface area thus increasing their contact with bacteria thereby vastly improving its bactericidal effectiveness. Nano-silver suppresses a bacteria cell s respiration and metabolism thus inhibiting cell growth that normally causes infection odor illness etc. Ingredients: Made from advanced PBT plastics these bristles outlast less expensive nylon bristles found on competitive toothbrushes. Directions: Dentists recommend replacing toothbrushes after 3 months of everyday use. You will find that your Mouth Watchers brush will last longer than this due to its high quality construction however we still recommend replacing it after 3 - 6 months of use.