Phase III Trial Shows Silver Diamine Fluoride Stops Cavities in Young Children Without Drilling or Sedation

Every year, untreated tooth decay pushes thousands of young children in the United States into emergency departments, where physicians can't actually fix the underlying problem. Some of those kids eventually end up in an operating room for dental surgery under general anesthesia. A new Phase III trial published this week in JAMA Pediatrics suggests a low-cost liquid could redirect a lot of that pipeline.

The trial, led by researchers at the University of Michigan School of Dentistry and reported in a University of Michigan news release, enrolled 830 children younger than 6, recruited through dental offices, pediatric medical practices, and Head Start and Early Head Start programs in Michigan, New York, and Iowa. Researchers tested 38% silver diamine fluoride, commonly called SDF, applied every six months to existing cavities.

The results were straightforward: applied in seconds with a small sponge-tipped applicator, SDF arrested decay in more than half of the affected primary teeth treated. No drilling. No injections. No sedation. The treatment was safe across the age range enrolled, including children as young as 1.

There is one real downside, and it matters at the bedside: the liquid permanently darkens the decayed area it treats. That's not a toxicity issue, but it's a disclosure conversation every clinician will need to have with parents before applying it. For a family weighing a blackened tooth surface against a trip to a surgical suite, though, that's usually not a hard call.

SDF isn't new to pediatric dentistry internationally. Dentists have used it for decades in other countries, and it's been used off-label in the U.S. for cavity arrest since 2015 after the FDA cleared it for tooth sensitivity treatment in 2014. What's been missing is the kind of large, rigorous domestic trial that tends to move U.S. clinical practice and payer coverage. This study was built to fill that gap.

The trial recruited specifically through Head Start programs, which means it reached a low-income, underserved pediatric population. That's the population where early childhood caries does the most damage and where access to conventional restorative dentistry is most constrained. Per the World Dental Federation, most children with early childhood caries globally never receive any treatment at all, in part because the dental workforce can't absorb the volume.

The practical pitch here is access and simplicity. SDF can be applied in a pediatric primary care office, not just a dental operatory. A pediatrician, nurse practitioner, or trained dental hygienist brushing a liquid onto a cavity in seconds is a very different care model than a child being scheduled months out for a restorative procedure that may never happen.

Lead investigator Margherita Fontana, a professor of dentistry at the University of Michigan School of Dentistry, told the University of Michigan news office: "This is a very effective and safe treatment, even in children as young as 1."

The study's DOI is 10.1001/jamapediatrics.2026.2567. Whether Medicaid programs and commercial insurers move quickly to cover it as a primary caries management tool, rather than as a last resort, is the next question.

Sources cited:
- University of Michigan News (https://news.umich.edu/drill-free-cavity-care-one-minute-one-tiny-brush-one-pivotal-trial/)
- MedicalXpress / JAMA Pediatrics (DOI: 10.1001/jamapediatrics.2026.2567) (https://medicalxpress.com/news/2026-07-silver-diamine-fluoride-treatment-halt.html)
- ScienceDaily (https://www.sciencedaily.com/releases/2026/07/260729010719.htm)
- International Business Times Australia (https://www.ibtimes.com.au/breakthrough-study-validates-silver-diamine-fluoride-1873258)