When the protective layer of the teeth (enamel) wears away or the gums recede, the dentin underneath is exposed. When exposed dentin comes into contact with hot, cold, sweet, or acidic food and beverages, it can trigger a brief, sharp sensation called tooth sensitivity. Sensodyne Repair & Protect is a daily fluoride toothpaste that helps repair and protect sensitive areas of teeth, while providing the benefits of regular toothpaste, such as strong teeth and healthy gums. The paste is powered by Novamin, a unique calcium formulation that helps repair sensitive areas with the natural building blocks of teeth. The paste also creates continuous protection with each brushing so you can enjoy your favorite foods and drinks without worrying about sensitive teeth. Sensodyne Repair & Protect Deep Repair Toothpaste.