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They first grew each cell type separately to make larger numbers of them and then injected them into a sticky protein called collagen.

The tooth germ grew into a tiny tooth about 1.3mm long. The researchers then extracted the incisor from an eight-week-old adult mouse and inserted the bioengineered tooth.

After two weeks, the transplant was found to be growing perfectly, with root, enamel, dental pulp, bone, blood vessel -- the same composition and structure as a normal tooth.