Scientists in Spain say prehistoric man worked out that using a mixture of frayed and sharpened sticks to clean his teeth after a meal gave him healthy gnashers long after other animals had lost theirs to decay.
Posted: 2013-10-18 17:04:00
Man’s greatest invention may not have been the wheel or taming fire¿ but the twig toothbrush, because it gave us longer lives to invent and evolve