Why use Sensodyne Repair & Protect Extra Fresh? It is possible to treat the pain of sensitive teeth and to repair these vulnerable areas. Sensodyne Repair & Protect Extra Fresh helps to repair and protect the sensitive areas of the teeth. Brush twice a day for lasting sensitivity protection. It contains fluoride to help strengthen the teeth and also has a fresh minty taste to leave your mouth feeling clean and fresh. What is tooth sensitivity? Sensitivity occurs when the dentine underneath the tooth enamel and gums becomes exposed. When exposed dentine comes into contact with hot or cold, sweet or sour, or even your toothbrush, it can trigger the nerve causing a short sharp pain. Novamin Formulation Sensodyne Repair & Protect toothpaste forms a hard layer over the vulnerable areas of your sensitive teeth to help provide strong repair. Sensodyne Repair & Protect, powered by Novamin®, is a unique, clinically proven calcium formulation. It helps to repair 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.