Sensodyne is specially formulated to care for sensitive teeth. When the enamel wears out or the gums recede, the dentin underneath is exposed. This can cause tooth sensitivity, for example with hot and cold food and drinks. creates a relaxing protection around the nerve, deep within the tooth. So you don't have to worry when you eat or drink Keep out of the reach of children. Brush twice a day and no more than three times. Minimize swallowing and spitting. Close the lid after each use to protect the contents from moisture. Do not use if box ends are open.