Introduction   Explanation of what Hap is Hydroxyapatite in its natural form is a type of calcium that makes up 97 percent of tooth enamel and 70 percent of dentin. The few remaining substances are water, collagen and other proteins. Hydroxyapatite is also the main (60%) component of bones. In addition to being used in toothpaste, as a cutting-edge new material in biomedical...