Sensodyne Extra Fresh provides relief from hypersensitivity, refreshes, and strengthens tooth enamel. Its gel-strip formula has a pleasant, minty flavor that provides long-lasting freshness. Fluoride strengthens tooth enamel and protects teeth against the risk of cavities. Toothpaste for hypersensitive teeth If you experience a brief, sharp pain when eating hot, cold, sweet, or sour foods, or even brushing your teeth, it may mean your teeth are sensitive. Sensodyne Extra Fresh is a clinically proven toothpaste for sensitive teeth. Its special, advanced formula soothes the nerve endings that react to sensitivity deep within the tooth, providing relief from sensitivity. Its formula offers effective protection against sensitivity for up to 24 hours*, while also providing the benefits of traditional toothpaste. With Sensodyne Extra Fresh with fluoride, you no longer have to worry when eating your favorite meals! *when brushing twice a day