Acid Erosion Protection with Instant & Lasting Sensitivity Relief (when used as directed)! Acids in everyday food & drink may soften the enamel. Strengthen and protect your tooth enamel from daily wear & tear How does Colgate* Sensitive Pro-Relief Enamel Repair work? - Remineralizes the enamel & makes teeth more resistant against repeated acid attacks more effectively than fluoride alone - Blocks the exposed channels in acid damaged enamel, that lead to sensitive tooth nerves for instant relief (when used as directed) - Builds a reparative layer that acts like a seal, helping to repair sensitive teeth for lasting protection against sensitivity, with regular use