Sensodyne Pronamel lntensive Enamel Repair Extra Fresh is proven to drive minerals deep into the enamel surface to help actively repair acid-weakened areas of the enamel, for stronger, better-protected teeth. Acids in your diet can weaken tooth enamel over time, exposing a dull yellow layer and making it more susceptible to further damage. While any toothpaste containing fluoride helps prevent this erosion, Intensive Enamel Repair, Pronamel�s most advanced enamel care formulation, is most advanced enamel care formulation proven to help actively repair acid-weakened enamel and protect teeth from future acid erosion. It works by locking in repairing minerals that absorb deep into the surface structure of enamel to help repair microdamage and rebuild enamel strength, leaving your teeth stronger and more protected.