Oral-B Charcoal Whitening Therapy Toothbrush Medium 6-pack Features Charcoal Infused Bristles Removes Hard to Reach Plaque Reduces Gingivitis Based on Short Term (3 months) Clinical Data Cleans Along the Gumline Whitens Teeth by Removing Surface Stains Gentle on Enamel and Gums. Massagers gently massage your gums and help clean along the gumline. Replace your brush every three months. Trust the brand more dentists use themselves worldwide, Oral-B.