Iowa study shows liquid can stop tooth decay without drilling or needles

A major clinical trial involving Iowa children has found that a simple liquid painted onto cavities can stop tooth decay in more than half of treated baby teeth without any drilling, injections, or sedation. Researchers say the findings could transform how cavities are treated, especially for young children, the elderly, and those with disabilities.

The study, published July 29 in JAMA Pediatrics, tested silver diamine fluoride (SDF) on 830 children under age six across Michigan, New York, and Iowa. The results showed that a 38 percent SDF solution applied every six months stopped decay in more than half of affected baby teeth.

“This is a very effective and safe treatment, even in children as young as one,” said Margherita Fontana, professor of dentistry at the University of Michigan School of Dentistry and lead researcher.

How silver diamine fluoride works

SDF is not new. Dentists in Japan, Australia, and parts of Latin America have used it for decades. In the United States, it has been available since 2014 but only as an off-label treatment for reducing tooth sensitivity, not officially for treating cavities.

The process is remarkably simple. A dentist or healthcare provider dips a small sponge-tipped applicator into the liquid and brushes it directly onto the decayed part of the tooth. The whole process takes seconds per tooth. The silver kills the bacteria driving the decay, and the fluoride helps harden the remaining tooth structure.

No drilling. No anesthesia. No screaming child in the chair.

Why this matters for Iowa families

Tooth decay is the most common chronic disease among children in the United States, affecting more than 40 percent of American kids. Untreated cavities send thousands of young children to emergency departments every year, where hospital doctors cannot fix the underlying problem.

This means missed school days, disrupted sleep, difficulty eating, and repeated trips to medical facilities. For Iowa families, especially those in rural areas with limited access to dentists, SDF could be a game changer.

“Young children often see pediatricians years before they ever visit a dentist,” Fontana noted. “Broader acceptance could allow many more cavities to be treated while a referral to a dental home is successful, and before they become painful, infected, or require surgery.”

Who benefits most from painless cavity treatment

Beyond young children, researchers highlighted several other groups who stand to benefit significantly from SDF.

Older adults, people with physical or developmental disabilities, patients with severe dental anxiety, and anyone in regions with limited access to conventional dental care are all candidates. For some patients, applying SDF every few months could manage a cavity until a baby tooth falls out naturally. In adults, it could serve as a longer-term solution or buy time until a more comprehensive procedure becomes affordable.

“For almost anyone, this can arrest the decay and stop the infection and the pain it causes,” Fontana said. “This could benefit many people.”

One trade-off: teeth turn black

There is one visible downside. The silver in the liquid permanently darkens the decayed portion of the tooth, turning it black. For baby teeth that will eventually fall out anyway, many families consider this a reasonable exchange. For adults or front teeth, it is a more complicated conversation.

FDA approval could change everything

The clinical trial was funded with more than $12 million from the National Institute of Dental and Craniofacial Research, part of the US National Institutes of Health. Elevate Oral Care, the company behind the SDF product tested, now has the clinical data needed to submit a formal drug application to the FDA for approval of SDF as a cavity treatment.

That approval would be a meaningful shift. Right now, because SDF is off-label for cavities, insurance coverage is inconsistent and uptake among providers is uneven. An official FDA indication would change both of those things.

“Removing SDF from off-label status would be an important innovation which could lead to increased utilization by providers, enhanced payments by insurers, and more consistent product quality,” said Amr Moursi, professor of pediatric dentistry at New York University College of Dentistry and a co-principal investigator on the study.

The science is there. The question now is whether the regulatory and insurance systems move quickly enough to get this simple, effective treatment to the people who need it most.