Sensodyne Repair and Protect toothpaste can actually repair sensitive teeth† for lasting sensitivity protection when you brush twice a day. Its active ingredient, stannous fluoride, builds a repairing layer over the vulnerable areas of your teeth and protects them from sensitivity tooth pain. When used as directed, Sensodyne Repair and Protect toothpaste provides effective lasting relief from the twinge of sensitivity and offers everyday tooth cavity protection. *With twice daily brushing †Sensodyne Repair and Protect 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.