Major Clinical Trial Confirms Cavity-Stopping Liquid Could Reshape Children's Dental Care

A multi-university clinical trial has produced some of the strongest evidence yet that a low-cost liquid treatment can stop cavities in their tracks without any of the procedures most people associate with a trip to the dentist. The treatment, known as silver diamine fluoride (SDF), is applied directly to a decayed tooth using a small sponge-tipped applicator in a matter of seconds. Researchers say the results could help pave the way for broader FDA approval of SDF as a drug specifically indicated for treating cavities.

The Phase III trial, led by the University of Michigan School of Dentistry and conducted at sites including NYU College of Dentistry and the University of Iowa, enrolled 830 children under the age of six who had severe early childhood tooth decay. Results showed that a 38% SDF solution, applied at six-month intervals, stopped decay from progressing in more than half of the treated baby teeth. Safety data from the trial were reassuring — reported side effects were comparable between the SDF and placebo groups, and lead investigator Margherita Fontana noted the treatment was well tolerated even in children as young as one year old.

How does it work? The silver component helps combat the bacteria responsible for decay, while the fluoride component supports the mineral structure of the tooth and helps it resist further damage. The main cosmetic drawback is that silver permanently darkens the decayed area of the tooth — something families would be informed about before treatment.

For many young children, untreated tooth decay currently leads to pain, infection, and in serious cases, surgery under general anesthesia. Advocates of minimally invasive dentistry say a fast, needle-free, drill-free option like SDF could be especially valuable in community health settings, such as Head Start programs, where access to full dental suites is limited. The study was published in JAMA Pediatrics and funded in part by the National Institute of Dental and Craniofacial Research (NIDCR).