Alice Klein
30 August 2019

Tooth enamel can now be made to repair itself by applying a special gel. The product could save people from developing cavities that require dental fillings.
Enamel is the hard, protective layer on the outside of teeth. It can be worn down by mouth acid and repeated chewing, leading to cavities that have to be plugged with fillings to prevent further decay.
Because fillings are made from foreign materials like metal, porcelain and resin, they dont bind seamlessly to the tooth surface and often become loose.
To overcome this problem, Ruikang Tang at Zhejiang University in China and his colleagues made a gel containing calcium and phosphate the building blocks of real enamel to try to encourage teeth to self-repair.

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