Biologists from Italy have concluded that the spread of tooth decay and gum infections among humans may be indirectly linked to the transition of hunter-gatherers to agriculture.
Comparing calcified plaque on 76 samples of human teeth that lived in the same area at different periods, the scientists noticed that the composition of oral bacteria in people differed depending on what period they lived in.
The age of the earliest samples was 31 thousand years, the latest - 4.2 thousand years. 49 species of bacteria changed around 6200 BC, that is, during the transition to agriculture in Italy.
The biologists published their work in Nature Communications.