Builds increasing protection against painful sensitivity of the teeth due to cold, heat, acids, sweets, or contact; aids in the prevention of dental cavities. Use Sensodyne whenever you normally brush: It contains Potassium Nitrate, clinically proven to reduce painful sensitivity. It provides fast relief of tooth sensitivity within two weeks. It has fluoride for cavity protection. It fights tartar and plaque buildup above the gumline, and promotes healthy gums with regular brushing. Its great taste keeps mouth feeling fresh and clean. It whitens teeth by removing surface stains.