The Oral-B Charcoal Whitening Therapy toothbrush features charcoal infused bristles! It whitens teeth by removing surface stains. PowerTip bristles help clean plaque in hard to reach places while Gum Massagers gently massage your gums and help clean along the gumline. Additionally, the Tongue and Cheek Cleaner work to gently clean your tongue and cheeks. Whitens teeth by removing surface stains. Dentists recommend changing your brush every 3 months. A new toothbrush can remove up to 30% more plaque than one 3 months old.