Every year, many children in the United States end up in emergency rooms because of untreated cavities. When doctors can’t fix the tooth, the pain can get worse and sometimes surgery is needed.
Researchers have found a cheap liquid called silver diamine fluoride (SDF) that can stop decay in just a few seconds. A dentist puts a tiny sponge on the tooth and paints the liquid on the spot. No drilling, no shots, and no anesthesia are required.
A Long‑Used Remedy Gets Strong Proof
SDF has been used for decades in other countries. In the U.S., dentists have been using it off‑label since 2014 to help with tooth sensitivity, but it wasn’t officially approved for cavities.
Now a large Phase III trial led by the University of Michigan provides the missing safety and effectiveness data that the FDA needs.
What the Study Found
The study involved 830 children under six years old from Michigan, New York, and Iowa. Kids received the liquid every six months.
Results showed that 38% of the treated baby teeth stopped decaying after just two applications. The liquid works by coating the damaged area, so the tooth does not have to be drilled out.
“It is a safe and powerful way to treat cavities, even in one‑year‑old children,” said Dr. Margherita Fontana, the study’s lead investigator.
Why It Matters
Tooth decay is the most common chronic illness in children, affecting more than 40% of U.S. kids. Untreated cavities can cause severe pain, infections, missed school, and sometimes the need for surgery.
SDF could be especially helpful for very young children, older adults, people with disabilities, or anyone who feels anxious about dental work. It also helps families who have trouble reaching a regular dentist.
What to Know About the Appearance
The only drawback is that the treated spot turns black because of the silver. This permanent stain is the trade‑off for stopping the decay.
Next Steps for Approval
The study’s data give the manufacturer the evidence needed to apply to the FDA for official drug approval. If approved, SDF could become a standard tool for pediatric dentists and even pediatricians.
Doctors say that having solid research will make them more comfortable using SDF, and it could allow children to get treatment before the pain gets bad enough to need a hospital visit.
Long‑Term Use
For some kids, re‑applying SDF every few months can keep the cavity under control until the baby tooth falls out naturally. Adults might use it as a temporary shield until they can afford a proper filling.
“Almost anyone can benefit from this treatment because it stops decay and the infection that causes pain,” Dr. Fontana added.