What is tooth sensitivity? Sensitivity can occur when the dentine underneath tooth enamel and gums becomes exposed. When exposed dentine comes into contact with hot or cold, sweet or sour, or even your toothbrush, it can trigger the nerve causing a short sharp pain. REPAIR + WHITENING + DEEP CLEAN*: Sensodyne Expert Repair Deep Clean & Whitening Toothpaste starts to repair sensitive teeth in just 2 minutes* and delivers a deep clean and 35% better whitening action*. HELPS REPAIR SENSITIVE AREAS*: The NovaMin formulation forms a reparative* layer over exposed dentine. This layer helps repair* sensitive areas of the teeth and strengthens with use. Sensodyne Expert Repair Deep Clean & Whitening Toothpaste helps repair* sensitive areas of the teeth, tackling sensitivity. It features a cool blend of peppermint & spearmint for a refreshing clean.