Fluoride free, this naturapeutic toothpaste protects enamel contains xylitol, calcium-rich hydroxyapatite and phosphorus. Xylitol comes from birch extract which helps fight bacteria that cause cavities. These natural ingredients have been clinically proven to protect enamel and the risk of dental erosion. It has been clinically proven to harden enamel by 80% after just 6 days of brushing, if used 3 times a day. Plenty to keep your planet and your teeth clean.