Colgate Max Fresh Cooling Crystal toothpaste is sodium fluoride, which helps to strengthen tooth enamel and prevent cavities. This toothpaste also contains special cooling crystals that release a burst of freshness when you brush, leaving your mouth feeling clean and invigorated. In addition to its cavity-fighting and freshening properties, Colgate Max Fresh Cooling Crystal toothpaste also helps to remove surface stains from teeth, giving you a brighter, healthier smile.