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Is fluoride an important nutrient for early pregnancy?
Ripples













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A beach house; Actual size=240 pixels wide






This drawing shows how the tooth grows. The ridges start as single points, then grow out towards each other. It is as if you dropped 4 pebbles into a calm pond and watched the ripples go out. Where the ripples meet is the bottom of the valleys. Next we will go down into the tooth, with a cross section taken along the dotted line at point B.

Spark