This pack of whitening replacement brush heads for the TAO Clean Umma Diamond Sonic Toothbrush includes 2 high-quality hygienically sealed brush heads that conform to the contours of your teeth for a long-lasting and deep clean. The whitening head’s patented design has 3 spiraling edge points of contact on every bristle, providing enhanced stain-fighting and plaque cleansing capabilities over 50% better than ordinary brush heads. As with any toothbrush, wear and tear on the bristles start to become noticeable after some time. To maintain a hygienic and effective mouth cleaning, brush heads must be changed at least every 3 months. TAO Clean products have a two-year warranty covering manufacturer-related defects.