“…Unlike bones, teeth consist of at least two different CaPO 4 materials: enamel, which is a rigid, inert and acellular outer layer, and dentine, which is a bone-like Mg-rich hard tissue that forms the bulk of vertebrate teeth. In addition, there is cementum, which is a thin layer of a bone-like calcified tissue that covers dentine at the roots of teeth and anchors them to the jaw (Ho et al 2009a, b;Bosshardt and Selvig 2000;Yamamoto et al 2010). Finally, there is the core called pulp (commonly called ''the nerve'')-it is a remnant of the embryologic organ for tooth development and contains nerves and blood vessels necessary for tooth function.…”