Researchers believe that a toothpaste made from hair-derived substances could protect and repair damaged teeth.

Scientists at King's College London found that keratin, a protein found in wool, skin, and hair, can inhibit early decay and help rebuild enamel. The study showed that when keratin interacts with minerals in saliva, it forms a protective layer similar in composition and function to that of natural enamel.

Sara Gamea, a PhD candidate and the study’s lead author, remarked, "Keratin provides a revolutionary alternative to existing dental treatments." She added, "This environmentally friendly biomaterial mimics natural processes, connecting biology and dentistry. It's sustainably sourced from waste materials like hair and skin, and it avoids the use of traditional plastics used in restorations, which are toxic and less durable."

The team isolated keratin from wool, and their findings, published in Advanced Healthcare Materials, revealed that keratin creates a structured, crystal-like framework that imitates the structure and function of real enamel. When applied to teeth and when it interacts with saliva minerals, this framework pulls in calcium and phosphate ions over time, forming an enamel-like protective layer.

Experts note that enamel erosion caused by acids, poor hygiene, aging, and dietary habits can lead to sensitivity, pain, and tooth loss. Dr. Sherif Elsharkawy, senior author and prosthodontics expert, explained, "Unlike bones and hair, enamel doesn't regenerate; once it's gone, it's gone forever." He added that biotechnology is enabling us to leverage the body's resources to restore biological functions, marking an exciting advancement.

With further research and industry collaborations, it might soon be possible to grow stronger, healthier smiles from something as simple as hair waste.

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