Arm & Hammer Enamel Care Daily Enamel Strengthening Sensitive Toothpaste is the only toothpaste that fixes the cause of sensitivity by sealing teeth and protecting exposed nerves with patented Liquid Calcium technology, to provide lasting relief with regular use. This unique formula works best when stored at normal room temperature (>20°C) and water is prevented from getting into the tube by replacing the cap after every use. If the product is out of normal room temperature (>20°C), allow it to return to normal temperature for ease of dispensing.