Raisins Not a Culprit for Tooth Decay

Debunking the Myth

Raisins Not a Culprit for Tooth Decay

It’s long been believed that raisins aren’t the healthiest snack for healthy smiles, but research may debunk that myth, say U.S. researchers.

In addition to the polyphenols, flavonoids and iron in raisins, U.S. researchers also found germ-fighters that may suppress tooth decay. One of the many antimicrobial phytochemicals found in raisins – oleanolic acid – has been shown to suppress the growth of decay-causing Streptococcus mutans.

The compound was effective against the bacteria at concentrations ranging from about 4 to 1,000 µg/ml. At a concentration of 31 µg/ml, oleanolic acid also blocked S. mutans adherence to surfaces. Adherence is crucial for the bacteria to form dental plaque the sticky biofilm consisting of oral bacteria that accumulates on teeth. After a sugary meal, these bacteria release acids that erode the tooth enamel.

Grape seed extract, high in proanthocyanidins, has the potential of being natural agent for non-invasive root caries therapy, the researchers said.

The researchers from the University of Illinois at Chicago, College of Dentistry hypothesized that raisins contain antimicrobial phytochemicals capable of suppressing oral pathogens associated with caries or periodontal diseases and thus benefit oral health.

Researchers said that the data counters a longstanding public perception that raisins promote cavities.