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Inadequate brushing and flossing leads to the build up of dental plaque, a sticky layer of bacteria, on the surface of teeth and gums.

Using a new method called palaeoproteomics, scientists can investigate the food proteins that became trapped and preserved in ancient people's dental plaque.

When he put the dental plaque under a primitive microscope, he was astonished to see single-celled organisms swimming about.

The study in PLoS Biology showed how a common type of bacteria found in the mouth that is linked with gum disease and dental plaque may support BV.

The team identified milk protein entombed in dental plaque on the teeth of prehistoric farmers from Britain.