Plaque Busters Original dental chews combine sweet potato and finely ground oyster shell in a natural, fully digestible dental treat. Your dog gets a tasty chew while you take care of their teeth. • Oyster shell has abrasive qualities that help remove plaque and tartar • Sweet potato with a flavour dogs love • Vitamins and minerals from sweet potato, oyster shell, citrus fibre and coconut oil An easy, tasty way to make dental care part of the routine.