It has fully smooth-rounded bristles to reduce damaging abrasion to the gums and tooth enamel. University studies prove that Terradent s advanced design and patented manufacturing technology with its thermo-welded head that does not have open pores where the bristles meet the brush head actually reduces the bacterial load that collects on your toothbrush no other toothbrush can make this claim. TerraDent s dentist-designed handle provides proper grip for better hygiene while the Flexzone neck better protects delicate gum tissue from too much pressure while brushing. TerraDent Toothbrushes are also economical: Replacement heads save your family money. With Terradent you save the handle and only need to purchase replacement heads in convenient multi-head packs.