Enamel is the tooth’s thin outer surface that keeps teeth strong, healthy and protects the dentine. Enamel wear is when the outer layer of the teeth erodes, and the underlying yellow dentine is exposed. Acids in everyday foods and drinks can weaken and wear away your tooth enamel. Over time, this can lead to sensitive teeth. DUAL ACTION ENAMEL PROTECTION + SENSITIVITY RELIEF: Sensodyne Sensitivity & Enamel Whitening Toothpaste has a dual action formula which helps restore enamel strength and relieve teeth sensitivity. HELPS RESTORE ENAMEL STRENGTH: The fluoride optimised formulation helps to restore enamel strength by driving more fluoride into the enamel layer. It starts to actively strengthen enamel from 1st use. Sensodyne Sensitivity & Enamel Whitening Toothpaste contains fluoride for daily enamel protection against acid erosion. It also contains Potassium nitrate that works deep inside the tooth to help calm painful sensitivity and provide 24/7* sensitivity protection.