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Back in the 17th and 18th centuries, many scientific works were written explaining the advantages of chocolate for medicine, and today it’s a regular food in army rations. Chocolate could help prevent tooth decay, according to scientists at Japan’s Osaka University. The cocoa beans from which chocolate is made have an antibacterial agent that fights tooth decay. These parts of the beans are not usually used in chocolate production, but in future they could be added back in to chocolate.