Hydroxyapatite is a major component and an essential ingredient for normal bones and teeth. Hydroxyapatite makes up the bones mineral and the matrix of teeth. It is hydroxyapatite that gives bones and teeth their rigidity. We have added a synthetic version into our whitening formula to replace any previously lost minerals from the tooth surface. This strengthens the protective layer of (enamel) and allows it to better protect the tooth’s inner layers (dentin), we have constructed our formula to ensure that our product not only strengthens, repairs, soothes and protects but it also whitens giving you the smile you have always desired.