400,000-year-old dental tartar provides earliest evidence of manmade pollution
Wednesday, June 17, 2015 - 10:50
in Health & Medicine
Most dentists recommend a proper teeth cleaning every six months to prevent, among other things, the implacable buildup of calculus or tartar—hardened dental plaque. Routine calculus buildup can only be removed through the use of ultrasonic tools or dental hand instruments. But what of 400,000-year-old dental tartar?