Weak areas exposed in the teeth are the cause of tooth sensitivity. With Sensodyne repair. protect and whitening toothpaste. these areas can be repaired. Sensodyne toothpaste repair. protect and whiten teeth by finding sensitive areas and creating a tooth-like layer on top of them. You can use it twice daily to help continuously repair. strengthen and protect your teeth from sensitivity. Meanwhile. Sensodyne repair. protect & whiten toothpaste helps keep your teeth their natural whiteness.