Hair Protein Could Hold Key to Repairing Tooth Enamel, Study Finds

Scientists at King’s College London have discovered a potential breakthrough in dental care using an unexpected source: keratin, the protein found in human hair, skin, and nails. Their research suggests this natural protein could help repair damaged tooth enamel, potentially offering a revolutionary approach to treating cavities and tooth sensitivity.

In laboratory tests, the keratin-based system demonstrated promising results in repairing early-stage enamel defects, restoring both the appearance and mechanical properties of teeth. This represents a significant advance beyond current treatments like fluoride, which can only slow enamel erosion rather than reverse it.

“This approach is particularly exciting because it addresses a fundamental limitation in dental care,” said a researcher involved with the study, which was published in the journal Advanced Healthcare Materials. “Once enamel is damaged, the body cannot naturally regenerate it.”

The research team harvested keratin from wool and developed a process where the protein forms a crystal-like structure when applied to tooth surfaces. When exposed to minerals present in saliva, particularly calcium and phosphate, this structure transforms into a durable layer that mimics natural enamel.

Over time, the keratin matrix attracts these minerals and incorporates them into a dense protective layer. This not only shields teeth from further wear but also seals nerve pathways that cause sensitivity, potentially addressing two major dental issues simultaneously.

Daily habits like consuming acidic beverages or inadequate oral hygiene gradually erode enamel, leading to sensitivity and eventually tooth loss. While fluoride treatments can slow this process, they cannot restore what has been lost. The keratin-based approach aims to actually halt and potentially reverse this damage.

What makes this discovery particularly appealing from an environmental standpoint is its sustainability potential. Keratin can be harvested from hair or wool that would otherwise be discarded, creating a valuable health product from what would typically be waste material.

The researchers envision this technology being incorporated into everyday dental products like toothpaste or used in professional treatments applied by dentists within the next few years. However, this timeline depends on further testing and commercial development partnerships.

Despite the promising results, the researchers acknowledge several limitations and challenges that need to be addressed before the technology can reach consumers. “Only limited enamel thickness was regenerated, along with questionable biocompatibility,” the study notes, adding that “the clinical applicability of this technique is challenging due to the complicated fabrication process.”

Questions remain about how thick and durable the regenerated enamel layer can become and whether it can withstand years of real-world use. Independent dental scientists have also cautioned that laboratory-based enamel regeneration studies often struggle to match the complexity of natural enamel formation.

The dental care market, valued at over $30 billion globally, has seen relatively few transformative innovations in preventive care over recent decades. Most advances have focused on cosmetic improvements rather than addressing the fundamental problem of enamel loss.

If the keratin-based method proves effective in human clinical trials, it could represent a paradigm shift in dentistry, moving from management of decay to actual regeneration of dental tissues. This would address a significant unmet need, as approximately 3.5 billion people worldwide suffer from untreated dental caries and related conditions.

The researchers are now working to optimize the formula and delivery method while planning for initial human trials. They are also exploring partnerships with dental care companies to accelerate development and eventual commercialization of the technology.