Description + - The Oral-B Indicator Contour Clean Toothbrush has blue bristles that fade halfway to white, letting you know when it’s time to replace your brush. And its bristles are curved to comfortably clean between teeth and along the gum line. Read more Reviews + - The Oral-B Indicator Contour Clean Toothbrush has blue bristles that fade halfway to white, letting you know when it’s time to replace your brush. And its bristles are curved to comfortably clean between teeth and along the gum line.