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A Chinese research team has grown rudimentary teeth out of the most unlikely of sources, human urine.

The results, published in Cell Regeneration Journal, showed that urine could be used as a source of stem cells that in turn could be grown into tiny tooth-like structures.

The scientists hope the technique could be developed into a way of replacing lost teeth.

Other stem cell researchers caution that that goal faces many challenges.

Teams of researchers around the world are looking for ways of growing new teeth to replace those lost with age and poor dental hygiene.

Stem cells – the master cells which can grow into any type of tissue – are a popular area of research.

The Chinese research team has grown rudimentary teeth out of the most unlikely of sources, human urine

The Chinese research team has grown rudimentary teeth out of the most unlikely of sources, human urine

The group at the Guangzhou Institutes of Biomedicine and Health used urine as the starting point.

Cells which are normally passed from the body, such as those from the lining of the body’s waterworks, are harvested in the laboratory. These collected cells are then coaxed into becoming stem cells.

A mix of these cells and other material from a mouse was implanted into the animals.

The researchers said that after three weeks the bundle of cells started to resemble a tooth: “The tooth-like structure contained dental pulp, dentin, enamel space and enamel organ.”

However, the “teeth” were not as hard as natural teeth.

This piece of research is not immediately going to lead to new options for the dentist, but the researchers say it could lead to further studies towards “the final dream of total regeneration of human teeth for clinical therapy”.