Teeth are primarily made up of dentine (inside) and the particularly hard enamel (outside).
Enamel in particular is made up almost exclusively of hydroxyapatite, Ca 5 (PO 4) 3 (OH).Enamel is comprised of needle-like hydroxyapatite crystallites that are bundled in parallel ordered prisms. This special microstructure makes enamel the hardest substance in the human body.
In summary, it can be said that teeth are hierarchical biocomposites with special properties:
- Fracture strength
- Self-repair mechanism by means of remineralisation from saliva
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