Oral-B Advantage 3D White Vivid works with toothpaste to whiten by polishing away surface stains; Polishing cups:  center bristles hold toothpaste to polish away surface stains for a naturally whiter smile; Power Tip Bristles:  Extra long bristles to help clean hard to reach places.; Indicator Bristles - Blue Indicator bristles fade halfway so you know when to replace your brush; Dentists recommend changing your toothbrush every 3 months; A new toothbrush can remove up to 30% more plaque than one 3 months old