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Researchers Blame Sports Drinks and Other Favorites, but Beverage Makers Find Fault With the Study

Feb. 16, 2005 -- Sports drinks and other beverages are on the losing end of a new study about dental erosion.

The study appears in General Dentistry's January/February issue. It tracks tooth erosion from a wide variety of drinks including cola and noncola soft drinks, sports drinks, commercial lemonade, bottled iced tea, and black tea.

The study found that noncola soft drinks, energy/sports drinks, and commercial lemonade "showed the most aggressive dissolution effect on dental enamel," write researchers J. Anthony von Fraunhofer, MSc, PhD, FRSC, FADM, and Matthew Rogers, DDS.

Rogers is with the USAF Dental Corps; von Fraunhofer is a professor of biomaterials science in the oral and maxillofacial surgery department at the University of Maryland Baltimore Dental School.

The study's results came from marinating chunks of healthy human tooth enamel in the drinks for a total of 14 days, weighing them every 24 to 48 hours. The solution's acidity was checked, and solutions were changed daily.

The study was intended to simulate the effects of normal beverage consumption over about 13 years.

"We were totally shocked at how aggressive these were towards dental enamel," von Fraunhofer tells WebMD. "This study revealed that the enamel damage caused by noncola and sports beverages was three to 11 times greater than cola-based drinks, with energy drinks and bottled lemonades causing the most harm to dental enamel," he says, in a news release.

The study's design drew criticism from the American Beverage Association (ABA), which represents nonalcoholic commercial drinks including soft drinks, sports drinks, bottled teas and waters, and juices.

"It certainly doesn't mirror reality," Richard Adamson, the ABA's vice president for scientific and technical affairs, tells WebMD. "Nobody holds liquid in their mouth 24 hours a day, 14 days in a row."

Adamson points out that saliva helps protect the mouth, as does brushing the teeth. He says that dental erosion has multiple causes, including behavior, lifestyle, diet, and genetics. "I would say it's irresponsible to blame foods, beverages, or any single factor for dental enamel loss," he says.

Craig Horswill, PhD, agrees. He's a principal scientist at the Gatorade Sports Science Institute. "Oral health is more complicated than one simple food," Horswill tells WebMD.

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