Sensitivity occurs when the dentine underneath the tooth enamel and gums becomes exposed. When exposed dentine comes into contact with hot or cold, sweet, sour or even your toothbrush it can trigger the nerve, causing a short sharp pain. It is possible to treat the pain of sensitive teeth and to repair vulnerable sensitive areas. Sensodyne Repair & Protect Whitening can actually help repair (1) sensitive teeth and helps to remove stains to restore the natural whiteness of your teeth. Brush twice a day for lasting sensitivity protection. Sensodyne Repair & Protect, powered by NovaMin, is a unique, clinically proven calcium formulation. It helps to repair (1) vulnerable areas with the natural building blocks of teeth. It relieves painful sensitivity to help you enjoy life without worrying about the pain of sensitive teeth. (1) Forms a protective layer over the sensitive areas of the teeth. Brush twice a day for lasting sensitivity protection.