The gently round-tipped CUREN filaments remain dimensionally stable and reach grooves around interdental spaces and gingival cuffs perfectly while simultaneously protecting your teeth and gently stimulating your gums.The unique sensitive soft toothbrushes have over seven times the number of individual bristles of ordinary brushes, making them much finer and denser than their standard counterparts.The gently round-tipped CUREN® filaments retain considerably less water than conventional nylon bristles. This results in their retaining their dimensional stability, so they reliably reach grooves around interdental spaces and gingival cuffs perfectly while simultaneously protecting the teeth and gently stimulating the gums.