Keratin from human hair can remineralize teeth: a potential breakthrough in restoring enamel’s crystalline lattice

Modern dentistry urgently needs materials capable of not only protecting enamel but also restoring its structure at the molecular level. Against the backdrop of increasing erosive lesions, hypersensitivity, and early carious processes, traditional approaches — including fluoride-containing pastes and synthetic resins — offer only limited effectiveness. They can slow tissue degradation but do not always initiate full regeneration or the formation of structures comparable to natural enamel.

This is precisely why the results of a new study from King’s College London have sparked such lively scientific interest. Researchers discovered that keratin extracted from wool or human hair can form a crystalline scaffold on the enamel surface, mimicking its natural structure. This discovery could lead to the creation of an entirely new generation of durable, biocompatible, and eco-friendly daily-use dental care products.

Unexpected discovery: keratin as a foundation for enamel regeneration

The study revealed that keratin can form a dense mineral coating that resembles natural enamel in its characteristics. When applied to the tooth surface and interacting with saliva minerals, the keratin structure acts as a sort of magnet for calcium and phosphate ions, creating conditions for the gradual buildup of an enamel-like matrix.

This ability distinguishes keratin favorably from conventional fluoride-based formulations. While fluoride only slows demineralization and strengthens existing enamel areas, keratin potentially enables structural restoration, densification of surface layers, and occlusion of dentinal tubules, which is particularly important in cases of dentin exposure and heightened sensitivity.

Experimental data: strength and biomimetic properties

In laboratory conditions, keratin formed an enamel-like crystalline structure on the tooth surface, which continued to mineralize over time due to ions from saliva. The researchers note that the resulting keratin matrix demonstrated outstanding physical and mechanical properties:

• Its hardness was 5–6 times greater than that of traditional resins used for treating early caries;
• The coating exhibited high resistance to mechanical stress;
• The material showed good adhesion and reproducibility.

Thus, keratin acts not merely as a protective barrier but as a true biomimetic analog of enamel, capable of integrating into the structure of natural tissues.

Technological process: transforming wool and hair into a biomaterial for enamel.

The study’s authors describe a technology that enables the transformation of keratin, extracted from wool and even human hair waste, into a substance that forms an enamel-like scaffold. This approach reflects a global trend toward recycling biological waste, particularly in medicine.

Advantages of keratin as a raw material:

• availability and abundance;
• eco-friendliness;
• absence of toxic components typical of plastic resins;
• potential for producing a “low carbon footprint” material.

Keratin-based materials could be incorporated into toothpastes, remineralizing gels, or professional dental products.

Researchers’ perspective: next-generation biomaterials

The study’s lead author, Dr. Sara Gomea, emphasizes the transformative potential of the discovery. In the university’s official press release, she noted that keratin “represents a sustainable and biocompatible alternative to existing dental materials.” Unlike traditional resins, keratin contains no toxic components, is not prone to rapid wear, and appears more natural, matching the shade of the patient’s enamel,
making it attractive for aesthetically-oriented restorations.

The senior author, Dr. Sherif Elsharkawy, adds that modern biotechnology is entering an era where dentistry can not only manage symptoms but also restore function using the body’s own biological materials. His metaphorical statement that soon “healthy smiles could literally grow from a haircut” has become a symbol for popularizing this research.

Commercialization prospects: from laboratory to toothpaste.

According to preliminary estimates, keratin-based formulations could be introduced for mass use within 2–3 years. To bring these products to market, scientists and industry must address the following issues:

• formula stability,
• flavoring agents and consumer properties,
• safety,
• dosage of the active component,
• conducting clinical trials.

Nevertheless, the potential of this development is immense: an inexpensive, biodegradable, abundant, and environmentally friendly material could radically transform the approach to preventing and treating early-stage caries.

Conclusion: the dawn of a new era in regenerative dentistry

Although the research is at an early stage and requires further validation in clinical settings, the discovery of keratin’s biomimetic properties could become a turning point in dentistry. The possibility of naturally restoring enamel using an inexpensive and eco-friendly material opens up prospects that were previously considered futuristic.

The study titled “Biomimetic mineralization of keratin scaffolds for enamel regeneration,” published on August 12, 2025, in the journal Advanced Healthcare Materials, is already positioned as a significant step toward sustainable, biologically-oriented dentistry.