The mesial outline of the tooth is straight or slightly convex, whereas the distal outline is much more convex.[16] Consequently, the height of curvature (the point furthest away from the central axis of the tooth) is closer to the mesioincisal angle on the mesial side while more apical on the distal side. The distal outline of the crown is more convex than the mesial outline, and the distoincisal angle is not as sharp as the mesoincisal angle. After the mammelons are worn away, the incisal edge of the maxillary central incisor is straight mesiodistally.