You floss twice a week (on a good month), rinse with whatever minty blue liquid your dentist pushes, and scrub with a toothpaste that promises “enamel repair.” But enamel doesn’t repair. Once it’s gone, it’s gone.

Unless, researchers say, you brush with hair.

A new study out of King’s College London claims that keratin—the tough protein found in your hair, skin, nails, and wool—can actually help regrow enamel. Not fill it. Not protect it. Regrow it. In lab tests, keratin bonded with minerals in saliva to form a dense, crystal-like layer that mimics the structure and function of real enamel. The team believes this could eventually stop cavities before they start.

“We may soon be growing stronger, healthier smiles from something as simple as a haircut,” said Dr. Sherif Elsharkawy, senior

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