Hydroxyapatite in toothpaste

https://www.cnn.com/cnn-underscored/health-fitness/what-is-hydroxyapatite What is hydroxyapatite? “Hydroxyapatite (HAp) is the main component of enamel and one of the most studied biomaterials in the medical and dental field,” says Dr. Jonathan B. Levine, the chief dental officer of Lenny Kravitz’s oral wellness brand Twice. “It makes up the main mineral part of bones and teeth — in fact over 90% of the foundation of enamel.” As the outermost layer of the teeth and the hardest substance in the human body, maintaining healthy enamel is essential to your oral and overall wellness. It protects the inner elements of the teeth from bacteria and decay, which when exposed can lead to cavities, serious infections, gum disease and even tooth loss.