"When the protective layer of teeth (enamel) is worn away or gums recede, the dentine underneath becomes exposed. When the exposed dentine comes in contact with hot, cold, sweet or sour food and drinks, it can trigger a sharp short sensation called tooth sensitivity. Sensodyne Repair & Protect is a daily fluoride toothpaste that helps to repair and protect the sensitive areas of teeth, while still providing the benefits of a regular paste like strong teeth and health gums. The paste is powered by Novamin, a unique calcium formulation that helps to repair sensitive areas with the natural building blocks of teeth. The paste also builds ongoing protection with every brush so that you can enjoy your favorite foods and drinks without the worry of sensitive teeth. Brushing twice a day provides protection from tooth sensitivity. Always follow instructions and guidance included on the pack before use."