Hydroxyapatite, also called hydroxylapatite (HA), is a naturally occurring mineral form of calcium apatite with the formula Ca5(PO4)3(OH), but is usually written Ca10(PO4)6(OH)2 to denote that the crystal unit cell comprises two entities. Hydroxylapatite is the hydroxyl endmember of the complex apatite group. The OH− ion can be replaced by fluoride, chloride or carbonate, producing fluorapatite or chlorapatite. It crystallizes in the hexagonal crystal system. Pure hydroxylapatite powder is white. Naturally occurring apatites can, however, also have brown, yellow, or green colorations, comparable to the discolorations of dental fluorosis.

Introduction                                            

Hydroxyapatite, also called hydroxylapatite, alkali type calcium phosphate, calcium is apatite (Ca5 (PO4) (OH) 3) natural mineralized.
OH- base can be fluoride, chloride and carbonate ions, generate fluorine apatite or chloride matrix apatite, the calcium ions can be a variety of metal ions by ion exchange reaction, form the corresponding metal ions M apatite (M on behalf of replacing calcium metalions)

Function                                                  

1.Health Whitening 
2.Remove plaque 
3.Improve gum problems 
4.Prevent tooth decay 
5.Fresh breath

Application
1. Bone replacement materials, plastic and cosmetic surgery, dental, chromatography purification, calcium supplement, is currently widely used in manufacturing with the tip of the teeth or bones composition new stuff.
2. Hydroxyapatite widely exists in the human body and milk, are mainly distributed in the human body in the bones and teeth, mainly distributed in the casein micelle in milk and whey.