Advanced dual action formula. Helps - prevent sensitivity; repair weakened enamel. Maximum strength (Maximum strength FDA allowed antisensitivity active ingredient). Prevent & repair + whitening. Where does sensitive tooth pain come from? Receding gums and damage to your enamel can expose thousands of microscopic channels which lead to your tooth's nerve center. When your teeth make contact with something hot, cold, or sweet, sensations are carried down these channels directly to the nerves, causing pain. The advanced dual action formula of Colgate Sensitive Prevent & Repair. Helps prevent painful sensitivity with a clinically proven formula. Helps repair weakened parts of sensitive teeth and strengthen enamel with fluoride. How does Colgate Sensitive Prevent & Repair work? Colgate Sensitive Prevent & Repair is a clinically proven formula that works fast, within 2 weeks. It provides long-lasting sensitivity relief and builds a protective shield to help prevent painful sensitivity with regular use. Recyclable tube. Learn more about recyclable tube at colgate.com/goodness. Save Water: Turn off the tap while brushing.