Listerine Total Care Enamel Guard is a specially formulated mouthwash designed to help protect tooth enamel from erosion. Enamel is the hard, protective outer layer of your teeth that can be weakened by acids found in food, drinks, and plaque. This mouthwash helps to strengthen the enamel by re-mineralizing it, making it more resistant to erosion. It also provides other benefits such as fresh breath and protection against cavities, tartar, and gum problems.