Q1860Mineralized dental calculus can trap DNA, proteins, microbes and food microremains for millennia, preserving evidence of ancient diet, health and oral ecology.
Dental plaque mineralizes during life, sealing tiny fragments from the mouth and meals into a hard deposit. Centuries later, researchers can recover oral bacteria, milk proteins, plant starches and other traces from it. A substance removed as nuisance in the present becomes, in archaeology, a rare molecular archive of ordinary bodies and everyday eating.









