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Posted at Jul 5, 2015 by MG

400,000-year-old dental tartar provides earliest evidence of manmade pollution » medicalnewstoday.com

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A new discovery has revealed an early prehistoric ‘balanced’ diet and presence of respiratory irritants that could have resulted from smoke inhalation from indoor fires used for roasting meat. The discovery was made at Tel Aviv University’s excavation of Qesem Cave. 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?

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http://www.medicalnewstoday.com/releases/295592.php

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