Tooth decay bacteria found in ancient molars

Researchers from Trinity College Dublin have found an "unprecedented quantity" of bacteria that cause tooth decay and gum disease in 4,000-year-old human teeth. The remains are thought to have belonged to a man from the Bronze Age. 

The rare dental remains were found in a limestone cave in County Limerick in Ireland, and researchers said the cool, dry conditions of the cave may have helped to preserve the bacteria. 

The team found DNA of Streptococcus mutans, a type of bacteria responsible for cavities, and Tannerella forsythia, which is associated with gum disease. 

Read more: BBC

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