Sensi UltraThin electric toothbrush refills, 2 pcs, Oral-B Properties: - the round petal shape is designed with the help of dentists; - has soft, ultra-thin bristles that have a delicate action on the gums, in combination with regular bristles that are hard on bacterial plaque; - Sensi Ultrathin removes up to 100% more plaque and reduces gum inflammation by up to 100% compared to a manual toothbrush; - the unique combination of ultra-thin bristles with round heads makes the Sensi Ultrathin brush head ideal for anyone with sensitive mouths or who wants an exceptionally gentle clean. How to use: Dentists recommend replacing your toothbrush head approximately every 3-4 months, or when the bristles become worn and discolored. Presentation: 2 pcs