Researchers develop fluoride-free gel that regrows tooth enamel

Tooth enamel, once lost, stays lost. The body has no mechanism to rebuild it. This hard outer shell—the toughest tissue in the human body—protects teeth from pressure, temperature swings, acids, and the simple wear of living. But it contains no living cells, which means damage is permanent. For decades, dentists have worked around this limitation with fluoride treatments and remineralization products that can strengthen what remains but cannot restore what is gone. Now researchers at the University of Nottingham have developed something different: a fluoride-free gel that actually regrows enamel by mimicking the biological process that builds it in infancy.

The gel works by drawing on a simple insight about how teeth form naturally. During childhood development, specific proteins guide the formation of enamel crystals in an organized, structured way. The Nottingham team engineered proteins that recreate this same function. When applied to a damaged tooth, the gel forms a thin, durable coating that penetrates the surface and fills microscopic cracks and pores. It then acts as a scaffold, pulling calcium and phosphate ions directly from saliva and using them to build new mineral crystals. Crucially, these crystals grow in alignment with the tooth's existing structure—a process called epitaxial mineralization—which means they integrate with the natural tissue beneath rather than forming a separate, weak layer on top.

The result is rebuilt enamel that closely matches the real thing. Dr. Abshar Hasan, the postdoctoral fellow who led the study, explained that when the material is applied to eroded or demineralized enamel, it promotes crystal growth in an integrated and organized manner, recovering the architecture of healthy enamel. The team tested this claim rigorously, subjecting the regenerated tissue to conditions that simulate daily life: repeated brushing, chewing forces, and exposure to acidic foods. The rebuilt enamel behaved just like healthy enamel under these stresses, suggesting it could actually hold up in a patient's mouth.

The practical advantages are significant. Unlike some experimental dental treatments, this gel can be applied quickly, using a process similar to how fluoride treatments are administered today. A dentist could apply it in a routine visit. The material is also scalable, meaning it could be manufactured at the volumes needed for widespread use. And it opens doors to multiple applications. Beyond repairing eroded enamel, the gel could help people with exposed dentin—the softer layer beneath enamel that becomes exposed when enamel wears away or gums recede. Dentin contains microscopic channels leading to the tooth's nerves, which is why exposed dentin causes sharp sensitivity to heat, cold, sweetness, or touch. When the gel is applied to exposed dentin, it can grow an enamel-like mineral layer over the surface, potentially reducing sensitivity while creating a stronger foundation for dental restorations.

The scale of the problem the gel addresses is substantial. Enamel damage is a major factor behind tooth decay and other dental conditions affecting nearly half the global population. Severe dental disease can lead to pain, infection, and tooth loss. Poor oral health has also been linked to broader health problems, including diabetes and cardiovascular disease. Existing fluoride products can help, but they work defensively—strengthening what remains rather than restoring what is lost. This gel represents a shift toward actual regeneration.

Professor Alvaro Mata, who led the research and is chair in biomedical engineering and biomaterials, emphasized that the technology was designed with both clinician and patient in mind. It is safe, rapidly applied, and scalable. The team has already begun moving toward commercialization through a startup company called Mintech-Bio, with the goal of bringing a first product to market within a year. The versatility of the approach means multiple products could eventually emerge—professional treatments for enamel erosion, over-the-counter products for sensitive teeth, materials designed to strengthen fillings and other restorations. The findings were published in Nature Communications, lending credibility to the team's claims about the gel's effectiveness.

What makes this work significant is not just that it works, but that it works differently. For the first time, a practical, scalable treatment could actually rebuild enamel rather than merely slow its loss. The gel does what the body cannot do on its own—it restores the microscopic architecture that gives enamel its protective power. If Mintech-Bio meets its timeline, patients could begin accessing this technology within months, potentially transforming how dentists approach one of the most common and difficult problems in oral health.