Hi! I'm Heather the Hygienist and I'd like to share with you why I created SSM Spearmint flavor. Nano hydroxyapatite (HAp), is a form of calcium that makes up 97% of your enamel, 70% of dentin, and 60%of your bone structure. Japan has been using HAp since the 80's and is their gold standard for re-mineralizing teeth. HAp REPLACES the minerals lost through de-mineralization and is scientifically shown to be more effective than fluoride. It also helps tremendously with sensitivity and since it is bio-identical to enamel, there is no need for a poison control warning that is found on commercial toothpaste. If you have any questions or concerns, before leaving a review, please contact us to see if we can make you a happy customer.