Dental effects of diet and coca-leaf chewing on two prehistoric cultures of northern Chile.

Two ancient cultures of northern Chile, the Chinchorro (9000-3500 BP) and the Maitas Chiribaya (850-700 BP) were examined for dental pathology in search of possible correlations between dental health, diet, and the cultural practice of coca-leaf chewing. The Chinchorro occupied the river mouth of the Azapa valley, subsisting almost exclusively on a maritime economy. The Maitas Chiribaya, descendants of migrant highlanders, had a rather well-developed agricultural subsistence base. The Chinchorro demonstrated extreme attrition rates and a correspondingly high frequency of periapical abscesses. They were essentially caries-free and enjoyed a moderate antemortem tooth loss frequency. The Maitas Chiribaya suffered light attrition; a high caries frequency, especially at the cementoenamel junction of crown and root, and a remarkably high antemortem tooth loss frequency. The cultural practice of coca-leaf chewing is implicated in the excessive posterior edentulism of the Maitas Chiribaya.