Toothbrush Oral-B Cross Action Medium color difference durable soft bristles are longer. Gum Massaging bristles - outer angled bristles gently massage and stimulate your gums and help clean along the gum line Multi-height, multi-angle bristles get deep between teeth. Blue Indicator bristles fade halfway so you know when to replace your brush Tongue freshner powers away odor-causing bacteria. A whole new dimension of freshness!