Builds increasing protection against painful sensitivity of the teeth due to cold, heat, acids, sweets, or contact; aids in the prevention of dental cavities. Dentists have been recommending Sensodyne for over 20 years. Brushing twice a day with Sensodyne builds a 'shield of protection' against painful sensitivity. And, since Sensodyne has fluoride, it helps protect against cavities too. Extra Whitening: Use Sensodyne whenever you normally brush: It contains Potassium Nitrate clinically proven to reduce painful sensitivity. It has fluoride for cavity protection. Its great taste keeps mouth feeling fresh and clean. It provides fast relief within two weeks. This product contains no sugar.