Tooth enamel is the hardest tissue in the human body. It has to be. Every day, it withstands chewing forces measured in hundreds of Newtons, temperature swings from ice cream to hot coffee, and the constant chemical assault of acidic foods and bacterial waste. A single human molar can bear loads exceeding 700 Newtons, roughly the weight of a small adult. Yet this remarkable substance harbors a cruel biological flaw: it contains no living cells. And what has no living cells cannot heal itself.
That paradox has been the central, frustrating fact of restorative dentistry for as long as the profession has existed. Once enamel is chipped, eroded, or worn away, the body has no way to rebuild it. The best existing treatments, fluoride varnishes and remineralizing toothpastes, can strengthen the enamel that remains, but they cannot replace the complex, organized microstructure of the original tissue. They cannot, in any meaningful sense, regrow it.
A team of researchers at the University of Nottingham has now demonstrated a solution that sidesteps the paradox entirely. Instead of trying to coax living cells into doing something they cannot do, they designed a protein-based gel that mimics the developmental biology by which enamel first forms in infancy. When brushed onto damaged teeth, the gel acts as a smart scaffold, guiding the growth of new mineral crystals that knit seamlessly into the tooth’s existing structure. The regenerated enamel, they report, behaves just like the real thing.
The work, led by postdoctoral fellow Dr. Abshar Hasan and senior author Professor Alvaro Mata, was published in the journal Nature Communications (DOI: 10.1038/s41467-025-64982-y).
A scaffold borrowed from development
Enamel is roughly 96% mineral by weight, the balance being water and a small fraction of specialized proteins. Those proteins are the key to the story. During tooth development in infancy and early childhood, specialized cells called ameloblasts secrete a complex mixture of structural proteins that self-assemble into a three-dimensional matrix. This supramolecular protein network then directs the growth of hydroxyapatite crystals, the calcium phosphate mineral that gives enamel its hardness, into precisely organized, parallel rods called enamel prisms. It is this hierarchical architecture, spanning from the nanoscale to the macroscale, that gives enamel its extraordinary toughness and resistance to fracture.
Once the tooth erupts and the ameloblasts are lost, that protein template is gone forever. No subsequent biological process can recreate it.
The Nottingham gel takes a different approach. Rather than depositing a synthetic mineral coating onto the tooth surface, a strategy that produces at best a thin, disorganized layer with little resemblance to natural enamel, the gel is designed to replicate the function of those original developmental proteins. It is a formulation of engineered peptides that, when applied to demineralized or eroded enamel, self-assemble into a transient scaffold on and within the damaged tooth surface. That scaffold penetrates microscopic cracks, pores, and eroded areas, filling defects that conventional treatments cannot reach.
Once in place, the gel triggers a process called epitaxial mineralization. It draws calcium and phosphate ions naturally present in saliva and guides their organized crystallization into new enamel prisms that are crystallographically aligned with the underlying healthy tissue. Rather than forming a separate, artificial cap, the new mineral bonds directly with the existing enamel, restoring both its microscopic architecture and its mechanical properties.
Real-world testing
The research team subjected the regenerated tissue to a battery of tests designed to simulate real-life conditions: repeated tooth brushing, cyclic chewing forces, and exposure to acidic foods and beverages. In each test, the regenerated enamel performed indistinguishably from healthy natural enamel. The new mineral layer did not delaminate, crack, or wear away preferentially. It withstood the same mechanical loads and chemical insults as the original tissue.
This is a critical distinction from earlier remineralization approaches. Fluoride varnishes, for instance, promote the formation of calcium fluoride or fluorapatite on the tooth surface, which can help prevent further demineralization and reduce sensitivity. But the resulting mineral deposit is structurally disorganized, much thinner than natural enamel, and lacks the hierarchical prism architecture that gives enamel its mechanical resilience. It is a patch, not a restoration. The Nottingham gel, by contrast, does not just deposit mineral; it recapitulates the developmental process by which mineral is organized, producing tissue whose structure and properties match the original.
A global problem with a near-term solution
Enamel damage is not a niche concern. The researchers note that it affects roughly half the global population, manifesting as cavities, erosion from acidic diets, attrition from grinding, and the widespread problem of dentine hypersensitivity, sharp, fleeting pain triggered by hot, cold, or sweet stimuli when enamel wears thin enough to expose the softer dentine underneath.
Clinical needs span the age spectrum. Children with developmental enamel defects, teenagers with early erosive lesions from sugary and acidic drinks, adults with bruxism-related wear, and older adults with accumulated erosion and abrasion all stand to benefit from a treatment that can actually restore lost enamel architecture rather than merely slowing further loss.
One particularly promising application is the treatment of sensitive teeth. When gel is applied to exposed dentine, it grows an enamel-like mineral layer over the surface, physically sealing the microscopic tubules that transmit pain signals to the nerve. Early results suggest this approach could offer more durable relief than current desensitizing agents, which often require repeated applications and provide only temporary benefit.
The technology may also find use in improving the durability of dental fillings. The interface between a filling and the tooth is a perennial weak point, micro gaps at the margin allow fluid and bacteria to penetrate, leading to secondary decay and eventual failure. A mineral layer that integrates directly with both the tooth and the restorative material could create a stronger, longer-lasting bond.
From the lab to the clinic
The research team has already begun the transition from bench to bedside through Mintech-Bio, a University of Nottingham spin-out startup. Professor Mata stated that the technology is designed with the clinician and patient in mind: it is safe, can be applied rapidly in a professional setting, and is scalable to commercial production. The company expects to have a first product on the market by mid-2027.
The gel’s versatility opens the door to multiple product forms. A professional-grade formulation could be applied in a dentist’s office for treating localized erosive lesions or extensive wear. A consumer version, resembling a toothpaste or rinse, could be used for maintenance and early intervention. And a specialized formulation could be used by dentists to seal and reinforce the margins of new fillings.
What makes the approach distinctive is its conceptual foundation. Rather than fighting the biological limitations of enamel, it works with them, borrowing a strategy that evolution itself developed but then abandoned after tooth eruption. By mimicking the developmental matrix that the body can no longer produce, the gel effectively resumes a process that nature left unfinished.
For the roughly 4 billion people worldwide with some form of enamel damage, that difference is not academic. It is the difference between patching a problem and actually fixing it.