Scientists explore zinc-based treatment to stop cavities without drilling
Tooth decay is the most common health condition in the world, affecting billions of people and often leading to painful cavities. Traditionally, the only way to treat cavities has been through drilling and filling—a process many people dread. But a breakthrough from New York University (NYU) could change that, bringing dentistry one step closer to a drill-free future.
NYU scientists are developing a zinc-based cavity treatment that may protect teeth from decay, block sensitivity, and stop cavities from spreading—all without drilling or leaving behind the dark stains caused by silver-based alternatives.
The problem with silver diamine fluoride
One promising non-invasive treatment already used by dentists is silver diamine fluoride, a clear liquid that halts early cavities and reduces tooth sensitivity. While it is affordable, easy to apply, and FDA approved for sensitivity treatment, it leaves a permanent black stain on treated teeth. This has limited its appeal, especially for visible front teeth.
“Once your teeth are treated with silver diamine fluoride, that stain is permanent, which is a barrier for many people wanting to use the product,” explained Marc Walters, professor of chemistry at NYU.
Turning to zinc for a stain-free solution
Walters and his team set out to solve the staining issue by replacing silver with zinc, a mineral already used safely in toothpaste, mouthwash, and dental adhesives. Their breakthrough compound, zinc tetramine difluoride, seeps into the tiny tubules inside dentin—the sensitive layer beneath tooth enamel—and transforms into a solid zinc oxide barrier.
This barrier has a dual effect:
- Blocks pain and sensitivity by sealing pathways to tooth nerves.
- Fights bacteria like Streptococcus mutans by slowly releasing antimicrobial zinc.
“In one of our studies, just two minutes after treatment, we saw the zinc forming long cylinders inside the dentin tubules,” Walters said. “It’s like putting a cork in place that stops pain and keeps bacteria out—and it happens almost instantly.”
Early results look promising
In lab tests, the zinc compound lasted in tooth samples for up to two months and could potentially remain effective for much longer. Unlike some sensitivity treatments that require repeated applications, this approach may provide long-term protection against both pain and decay.
Walters partnered with Deepak Saxena, professor of molecular pathobiology at NYU College of Dentistry, to advance the research. Together, they secured a nearly $300,000 grant from the National Institutes of Health (NIH) to further study the compound’s safety, shelf life, and ability to stop bacteria in its tracks.
Australian dental materials company Southern Dental Industries (SDI) has also licensed the zinc technology, positioning it for future commercialization.
What this could mean for patients
If clinical trials confirm its safety and effectiveness, the zinc-based treatment could:
- Allow dentists to stop cavities without drilling.
- Help children and anxious patients avoid painful procedures.
- Protect older adults with root sensitivity and hard-to-treat cavities.
- Eventually be developed into consumer-ready products for at-home use.
“The mouth is full of bacteria, so a treatment must both block pain and prevent decay without staining teeth,” Saxena noted. “If zinc achieves this, it could redefine how we prevent and manage tooth decay.”
For billions of people worldwide, this research represents hope for a future with fewer cavities, less pain, and no drill in sight.
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