Vulnerable areas of exposed dentin are a common cause of sensitive teeth. Sensodyne Repair and Protect Whitening toothpaste repairs those sensitive areas† by forming a layer over them.Brushing with it twice a day, every day, will continuously help repair, strengthen, and protect your teeth from sensitivity. At the same time, Sensodyne Repair and Protect Whitening toothpaste helps you restore the natural whiteness of your teeth.*With twice daily brushing†Sensodyne Repair and Protect Whitening toothpaste is intended for the relief of occasional dentin hypersensitivity that occurs when sensitive teeth are exposed to hot or cold substances. It contains stannous fluoride, a well-established, effective tooth desensitizer with remineralization properties. There is a general scientific consensus that occluding exposed dentin effectively relieves the occasional pain of dentin hypersensitivity.