Sensodyne Classic Toothpaste Sensodyne Classic Toothpaste relieves the pain of sensitive teeth by blocking the openings in the surface of exposed dentine, thus preventing the pain stimulus getting through to the nerves of your teeth. Sensodyne Classic Toothpaste is fluoride free. Ingredients Aqua, Glycerin, Calcium Carbonate, Strontium Chloride Hexahydrate, Sorbitol, Silica, Hydroxyethylcellulose, Sodium Methyl Cocoyl Taurate, Aroma, PEG-40 Stearate, Sodium Saccharin, Cinnamal, Limonene, CI 77891, CI 45430.