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 Brush Twice A Day To Relieve Sensitivity - Sensodyne contains potassium nitrate, an ingredient clinically proven to reduce painful sensitivity. If you brush twice a day with Sensodyne, you should begin to feel relief within two weeks. #1 Dentist Recommended Brand for Sensitive Teeth - 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. Visit us at Sensodyne.com