From VOA Learning English, this is the Health Report. Nearly 4 billion people around the world have serious, untreated problems with their teeth. That is what a recent report from the World Health Organization says. Health officials say failure to repair cavities can even lead to social and emotional problems. Wagner Marcenes is with the Institute of Dentistry at Queen Mary, University of London. He led a team of researchers as part of the Global Burden of Disease 2010 study. They used the information to estimate rates of infection....
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