sentences:  The substances were integral to the diet of extinct hominids, and their molars were subject to the constant occlusal attrition from the stress of vigorous mastication.The development and evolution of this trait was characterized by a thick coating of enamel surrounding the molars and premolars, mitigating the detrimental effects of the tough diet.As such, this postcanine dentition is capable of “crushing and grinding” the tough shoots and leaves common to the diet of an early hominid.