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 proven to help actively repair acid-weakened enamel and protect teeth from future acid erosion. It works by locking in minerals into the surface of the enamel. It helps repair and rebuild micro damage in the enamel surface. Helping protect enamel against future acid wear.