A 3D Printer cannot print a material which will crumble, melt or break during the printing process. This excludes a lot of materials due to the pressure/tempera

A 3D Printer cannot print a material which will crumble, melt or break during the printing process. This excludes a lot of materials due to the pressure/temperature required in order to achieve cohesion. Natural teeth are made of a nanostructured material (dense hydroxyapatite nanorods in a less dense hydroxyapatite matrix) which is the sort of thing that cannot be 3D-printed.