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a Occlusal aspect of a subject living on a raw food diet with multiple acid impacts, and a medieval subject b with an assumed abrasive diet (images a, b, and c samples from [13, 15]). Occlusal/incisal defects in a subject with chronic vomiting d and in a medieval subject c. The shape of lesions from predominantly erosive and predominantly abrasive aetiology is strikingly similar
