What the trial found
- Decay stopped in most treated teeth: Applied every six months, 38 percent silver diamine fluoride halted decay in more than half of the affected baby teeth.
- No drill, shot, or sedation: The liquid goes on in seconds with a sponge-tipped applicator, which sidesteps the biggest barrier to treating very young children.
- Large, federally funded trial: 830 children under age six, recruited across Michigan, New York, and Iowa, backed by over 12 million dollars from the NIH.
- One real cost: The silver stains the decayed spot black, permanently. That is the trade families weigh against avoiding the drill.
The study at a glance
| Parameter | Detail |
|---|---|
| Publication | JAMA Pediatrics, July 29, 2026 (DOI: 10.1001/jamapediatrics.2026.2567) |
| Study start | 2018 |
| Participants | 830 children younger than age 6 |
| Recruitment sites | Dental offices, pediatric practices, and Head Start programs in Michigan, New York, and Iowa |
| Treatment | 38 percent silver diamine fluoride (Advantage Arrest, Elevate Oral Care), applied every 6 months |
| Funder | NIH National Institute of Dental and Craniofacial Research (over 12 million dollars) |
A cheap liquid does what a drill usually does
Tooth decay is the most common chronic disease of childhood, and treating it in a two-year-old is genuinely hard. Small children rarely hold still for a drill. The alternative has often been sedation or general anesthesia, which carries its own risk and cost. So the appeal of a treatment you can brush on in seconds is obvious.
That is what this trial tested. Researchers led by Dr. Margherita Fontana at the University of Michigan School of Dentistry, with Dr. Amr Moursi at the New York University College of Dentistry and collaborators from the University of Iowa and Indiana University, followed 830 children younger than six. The work was published in JAMA Pediatrics on July 29, 2026.
The intervention is a liquid called silver diamine fluoride, or SDF. A clinician dabs it directly onto a cavity with a small sponge-tipped applicator. It takes seconds. No drilling, no injection, no sedation. Applied every six months, the 38 percent formulation stopped decay in more than half of the affected baby teeth.
How silver diamine fluoride works on a tooth
SDF pairs two active ingredients. The fluoride helps rebuild and harden the mineral surface of the tooth. The silver acts against the bacteria driving the decay. Together they arrest a cavity that is already underway, turning a soft, active lesion into a hardened, stalled one.
Here is the catch, and it is worth being upfront about it. The silver reaction darkens the decayed area to black, and that change is permanent. On a front tooth in a smiling toddler, some parents balk. On a back molar, most do not. For a lot of families the math is simple: a dark spot beats holding a screaming child down for a drill, or putting them under anesthesia.
Dr. Fontana put the safety case plainly, calling the treatment “very effective and safe – even in children as young as 1.” The product used in the trial was Advantage Arrest 38 percent SDF, supplied by Elevate Oral Care.
Why this matters beyond the dentist’s chair
The reach here is really about access. Sedation dentistry needs a specialist, an operating setup, and money. A sponge-tipped applicator does not. That opens the door to treating decay in settings where a full dental operatory is not practical, which is exactly why the trial recruited through Head Start programs alongside dental and pediatric offices.
The scale of the funding signals how seriously the field takes this. The National Institute of Dental and Craniofacial Research put more than 12 million dollars into a study that started back in 2018. That is a long, deliberate look at a cheap tool, not a quick press-release finding.
SDF is not magic. It arrests decay rather than rebuilding a badly broken tooth, so a child with extensive damage may still need conventional work down the line. But for stopping active cavities in the kids who are hardest to treat, a trial this size gives dentists real numbers to point to.
What to watch next
The trial answers the practical question, does brushing SDF on twice a year stop decay in young children, with a clear yes for most treated teeth. What it does not settle is longer-term durability across every type of lesion, or how families weigh the staining once it is on their own child’s tooth. Those are the threads follow-up work will likely pull.
For now, the takeaway for parents is concrete. If a very young child has a cavity, there is a painless, drill-free option with a large trial behind it. The main question to ask a dentist is not whether it works, but where the dark spot will show.
Sources:
- ScienceDaily: https://www.sciencedaily.com/releases/2026/07/260729010719.htm
- JAMA Pediatrics: https://doi.org/10.1001/jamapediatrics.2026.2567
Disclaimer: This article is for general information only and does not constitute medical advice, diagnosis, or treatment. Always consult a qualified healthcare provider about any medical condition or before making health decisions.