It's a fast way to relieve sensitivity pain, and help stop it coming back. With twice daily brushing, it builds ongoing protection from the pain of sensitive teeth. It also whitens enamel and prevents staining.Sensitivity occurs when the dentine underneath tooth enamel becomes exposed. When exposed dentine comes into contact with hot or cold, sweet or sour, or even your toothbrush, it can trigger the nerve causing a short sharp pain.Sensodyne Rapid Relief is clinically proven for fast relief of sensitivity pain.Its unique formula acts to quickly create a barrier over sensitive areas of your teeth.It provides fast relief and builds ongoing protection with every brush.Sensodyne Rapid Relief Whitening effectively removes stains to restore the natural whiteness of your teeth, with twice daily brushing. How to use : Brush twice a day and not more than three times, minimise swallowing and spit out. For fast relief, brush sensitive areas first or squeeze a pea-sized amount onto a clean fingertip and gently rub onto each sensitive area (max. twice per day) 1 minute before brushing.Close cap after each use to protect contents from moisture.