Phase III Trial Backs Cavity-Arresting Liquid for Young Children, Bolstering FDA Drug Application

Every year, thousands of young children in the United States end up in emergency departments with tooth pain that ER physicians can't actually fix. They're sent home with antibiotics, maybe a painkiller, and a referral the family may never follow up on. Some of those kids eventually go under general anesthesia for dental surgery. A new trial published this week in JAMA Pediatrics suggests there's a faster, cheaper, and far less traumatic option sitting in plain sight.

The study, led by researchers at the University of Michigan School of Dentistry and covered in detail by University of Michigan News, tested silver diamine fluoride, a liquid applied directly to a cavity using a small sponge-tipped applicator. The whole thing takes a matter of seconds per tooth. No drill. No needle. No sedation.

The results were clear. According to findings reported in JAMA Pediatrics, at six months, 54% of lesions treated with silver diamine fluoride had arrested, compared with 22.5% in the placebo group. At eight months, arrest rates were 50.2% for the treatment arm versus 17.4% for placebo.

This wasn't a small pilot. The Phase III trial enrolled 830 children younger than six years old, recruited through dental offices, pediatric medical practices, and Head Start and Early Head Start programs in Michigan, New York, and Iowa. That recruitment pipeline matters: Head Start serves predominantly low-income families, which means the study population reflects the kids who are actually carrying the heaviest burden of untreated decay in this country.

Silver diamine fluoride isn't new. Dentists have used it successfully for decades in other countries, and it's been used off-label in the United States since 2014, when the FDA cleared it as a medical device for tooth sensitivity. But off-label use has limits. It can create insurance coverage gaps, limit institutional uptake, and leave clinicians without the standardized guidance they want before changing practice. That's the gap this trial was designed to close.

According to the University of Michigan News account of the study, the trial's outcomes provide the clinical evidence needed for the manufacturer to file a dental caries drug application with the FDA. Amr Moursi, a professor of pediatric dentistry at New York University College of Dentistry and a co-principal investigator, said the results support FDA approval of silver diamine fluoride for managing decay arrest in young children.

Lead investigator Margherita Fontana, a professor of dentistry at the University of Michigan School of Dentistry, said the treatment was effective and safe, including in children as young as one.

There is one real tradeoff families need to know about upfront: the treatment permanently darkens the decayed area of the tooth. That staining has historically been the biggest barrier to parental acceptance, and it's not a trivial concern. For a baby tooth that's going to fall out in a few years anyway, most clinicians and parents may find the tradeoff easy. For other situations, it's a conversation that needs to happen.

Researchers noted that silver diamine fluoride could be especially useful for very young children, patients with dental anxiety, people with developmental or physical disabilities, and anyone without reliable access to traditional dental care. For some children, reapplying the liquid every few months may be all that's needed until the baby tooth naturally falls out.

The research ran from 2018 through the COVID-19 pandemic and was supported by more than $12 million from the NIH's National Institute of Dental and Craniofacial Research. That's a significant public investment, and the payoff, if FDA approval follows, could be felt most in the communities the trial deliberately tried to reach.

Sources cited:
- JAMA Pediatrics (via University of Michigan News) (https://news.umich.edu/drill-free-cavity-care-one-minute-one-tiny-brush-one-pivotal-trial/)
- Dentistry.co.uk (https://dentistry.co.uk/2026/07/30/silver-diamine-fluoride-childhood-decay-trial/)
- Medical Xpress (https://medicalxpress.com/news/2026-07-silver-diamine-fluoride-treatment-halt.html)
- SSBCrack News (https://news.ssbcrack.com/new-study-supports-silver-diamine-fluoride-as-effective-treatment-for-pediatric-tooth-decay/)