You can now choose the stiffness of nylon that best suits your specific requirements to clean plaque and stains caused by coffee, tea, nicotine, red wine, etc. These new coloured nylon brushes are manufactured in 3 gauges of high quality flexible nylon. They are designed for use with STODDARD prophy polishing paste. Benefits Used to clean plaque and stains caused by coffee, tea, nicotine, red wine.