Scientists at King’s College London have discovered that a protein found in human hair could one day be used in toothpaste to repair damaged teeth and prevent tooth loss.
The protein, called keratin, is already common in shampoos and skincare products. Now, researchers believe it could be just as valuable for oral health.
Dr. Sherif Al-Sharkawi, who led the study, called the finding a “game changer.” He explained that keratin has the potential to help teeth fix tiny cracks and defects on their own. “If you have a microcrack or a very small defect in your tooth, it will heal on its own without you even realizing it,” he said.
Protecting and repairing enamel
Tooth enamel—the outer surface of the tooth—doesn’t naturally grow back once it’s worn down. Problems like sensitivity and cavities often begin with weakened enamel.
The study showed that when keratin interacts with minerals in saliva, it creates a coating that mimics enamel, sealing small flaws before they turn into bigger issues.
A new future for dental care
Although more testing is needed before keratin-based toothpaste becomes available, experts believe it could change how we care for our teeth—moving from just protecting them to actually repairing damage.
