How is the dentinoenamel junction characterized in terms of its shape and direction?

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Smooth without any scallopingLinear and flatScalloped with convexities facing the dentinScalloped with convexities oriented toward the enamelIrregular and uneven

Explanation

The dentinoenamel junction (DEJ) exhibits a scalloped pattern where the convexities point toward the dentin, enhancing the mechanical interlocking between enamel and dentin. It is neither smooth nor straight, and the convexities do not face enamel.