New permanent teeth are not as strong as you might think. The enamel on newly erupted permanent teeth is softer and more vulnerable to cavities, and the presence of both baby teeth and permanent teeth makes them difficult to clean. The JUNIOR toothpaste from Aquafresh is specifically designed for children aged 6 and up: it helps to strengthen and protect enamel from cavities caused by plaque acids. It helps protect teeth from cavities. It helps strengthen tooth enamel, especially baby teeth. It helps fight plaque formation.