Linear enamel hypoplasias manifested as horizontal grooves in several teeth of this Inuit specimen.
Images of tooth surfaces taken with a scanning electron microscope. At left is an Inuit tooth with a linear enamel hypoplasia; at right is a Neanderthal tooth showing no linear enamel hypoplasias. The small horizontal lines covering the surface of each tooth are perikymata, enamel growth increments representing approximately 8 days worth of growth.
Image of an Inuit linear enamel hypoplasias with perikymata visible within the defect. Counting the number of perikymata within the linear enamel hypoplasias allows one to estimate the period of time during which enamel growth was disrupted.

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