Oral-B Indicator Toothbrush 35 has medium bristles and a clever indication system that lets you know when it\'s time to change your brush. Oral-B Indicator Toothbrush 35 Medium is designed for every-day cleansing for your teeth and tongue. It removes and prevents plaque buildup, helping get rid of any food debris and keeping your breath delightfully fresh and clean. Indicates when to change your brush This toothbrush is designed with a clever indication system that lets you know when you need a new toothbrush. It is designed with blue indicator bristles that fade to white when it\'s time to replace your brush.