Sensodyne Pronamel Active Shield Whitening Enamel Toothpaste helps prevent cavities and reinforce enamel, in a great tasting cool mint toothpaste. This cavity protection toothpaste builds 2x the acid resistance from day one against dietary acids versus your mouth’s natural defenses and continues to work even after brushing to help keep your teeth strong and healthy. Sensodyne Pronamel Active Shield whitening toothpaste with fluoride lets fluoride bind to and act on enamel to remineralize the surface of teeth and improve resistance against future acid attacks.