The Oral-B Indicator Max Toothbrush has color changing bristles that fade from green to yellow to let you know when it is time to replace your brush. The contour fit bristles help to remove plaque from the contours of your teeth. The gentle ended rounded bristles are designed to be gentle on your teeth and gums while providing an effective clean. For the best results, change your toothbrush regularly. For adults and children 3+. A new toothbrush cleans 95% better in hard to reach areas*. Oral-B is the #1 Toothbrush Brand Used by Dentists Worldwide. Colors may vary.*vs one 3 months old; research with a flat trim brush