Age; Apatite; BSE; BSE, Backscatter Electron; Ca, Calcium; Cl, Chloride; DEJ, Dentine-enamel junction; DT, Dentine Tubule; Dentine; EPMA, Electron Probe Microanalyser; Ga, Gallium; H, Hydrogen; Human; ITD, Intertubular Dentine; Intertubular dentine; LA-ICP-MS, Laser Ablation Induction Coupled Plasma Mass Spectroscopy; Mg, Magnesium; Mineral; Na, Sodium; O, Oxygen; Odontoblasts; P, Phosporus; PTD, Peritubular Dentine; Peritubular dentine; SEM, Scanning Electron Microscope; SEM-EDS; SEM-EDS, Scanning Electron Microscope Energy Dispersive X-ray Spectroscopy; TEM, Transmission Electron Microscope; TIMA, Integrated Mineral Analysis; XE PFIB-SEM, Xenon Plasma Focussed Ion Beam Scanning Electron Microscope; Xe PFIB-SEM; ß-TCMP, Magnesium-whitlockite