400,000-year-old dental tartar provides earliest evidence of manmade pollution
Tel Aviv, Israel (SPX) Jun 22, 2015 - 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? Tel Aviv University researchers, in collaboration with scholars from Sp ... more

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