A new substance could make filling cavities obsolete.

A team of French scientists have developed a new hormone gel that regenerates tooth cells and could potentially eliminate the need to fill cavities or drill into the root canal of an infected tooth. The gel contains a peptide called MSH which is known to encourage bone regeneration, and if placed near a cavity, it would allow cells to grow and heal the tooth from within.

The scientists found that when this gel was tested on mice that had cavities, the cavities disappeared after a month and new, stronger tooth cells grew. However, they said they would need more research to prove the hormone gel would work for humans.

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