What is hydroxyapatite?
Hydroxyapatite is a type of calcium. (1)
Hydroxyapatite is a type of crystalline calcium phosphate. (2)

Where is hydryoxyapatite located?
occurs naturally in the human body (1)

What contains hydroxyapatite?
70% of the bones in the body contains hydroxyapatite (1)
hydroxypatite is the main mineral present in enamel of a tooth (1)

Resources
1. https://www.dentaly.org/us/oral-health/remineralize-teeth/
2. https://en.wikipedia.org/wiki/Tooth_enamel

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