hydroxy-apatite and fluorine.

Question 1

hydroxy-apatite

Answer 1

•Naturally occurring mineral form of calcium phosphate.

•Most common type of calcium.

•Forms hexagonal units that overlap, creating a crystal structure.

•Enamel consists of thousands of these crystals.

Question 2

Fluorine

Answer 2

•Increases resistance to demineralization in hydroxyapatite.

•Depends on external intake.