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 Fresh Gel is a daily fluoride toothpaste that helps protect against tooth sensitivity while still providing the benefits of a regular paste like strong teeth and health gums. It also has a cool refreshing taste that leaves your mouth feeling fresh and clean. With twice daily brushing you can enjoy your favorite foods and drinks without the worry of sensitive teeth. Always follow instructions and guidance included on the pack before use.