A 2025 study by King's College London explored using what unusual material for toothpaste to repair tooth enamel?

A 2025 study by King's College London explored a truly unexpected material for toothpaste to repair tooth enamel: human hair. Scientists discovered that keratin, a protein abundant in hair, skin, and wool, holds remarkable potential for regenerative dentistry. This innovative approach aims to tackle the persistent problem of tooth enamel erosion, which, unlike other parts of the body such as bones, cannot naturally regenerate once lost.

The research revealed that when keratin is applied to the tooth surface, it interacts with minerals present in saliva to form a protective coating. This coating impressively mimics the structure and function of natural enamel, acting as a scaffold that attracts calcium and phosphate ions to rebuild the tooth over time. This process not only helps to repair early stages of decay but also creates a dense mineral layer that protects the tooth and seals exposed nerve channels, offering relief from sensitivity.

Current fluoride toothpastes work primarily to slow down enamel erosion and decay. However, the keratin-based treatments investigated by the King's College London team were found to stop this process completely in laboratory tests, representing a significant leap forward in oral care. The use of a sustainable material like keratin, which can be sourced from biological waste such as human hair or wool, also offers an eco-friendly alternative to traditional dental materials. Researchers envision this treatment being available as a daily-use toothpaste or a professionally applied gel within a few years, potentially revolutionizing how we protect and repair our teeth.