Features of Mandibular Central Incisor and Lateral Incisor are very similar, which makes it important to know even the minute differences present. Some general features to begin with, mandibular central incisor is the first tooth from the midline and lateral incisor is the second tooth from the midline. This difference in position changes their tooth numbers in various tooth numbering systems. Chronologically, central incisor erupts at the age of 6 to 7 years and lateral incisor at the age of 7 to 8 years. Coming to measurements. Except the crown length, which is same in both incisors, the lateral incisor is bigger than central incisor in all dimensions. Now, let us study the differences in morphology from each aspect, starting with the labial aspect. The outline form of the crown is trapezoidal in both the teeth. In mandibular central incisor, the incisal surface is horizontal so that it is perpendicular to the midline axis, whereas, in lateral incisor the incisal surface is not horizontal and so it is at an angle to the midline axis, as the distal side of the surface tilts cervically. Coming to the contact areas, both the mesial and distal contact areas of both incisors are in the incisal third however, in central incisor both contact areas are at same level, but in lateral incisor both contact areas are not at the same level, as the distal contact area is slightly cervically placed. Next, the lingual aspect. The difference in features from labial aspect are same from the lingual aspect as well. Next, the mesial aspect. There are no differences in the morphological features of central incisor and lateral incisor. Next, distal aspect. Similar to mesial aspect, there are no differences in the morphological features of central incisor and lateral incisor. Finally, the incisal aspect. The only difference from incisal aspect is the angulation of the incisal ridge. In central incisor, the incisal ridge is horizontal, so that it is perpendicular to the labio-lingual axis, but in lateral incisor the incisal ridge is not perpendicular to the labio-lingual axis, but at an angulation. This is because, the distal side of the crown has a twist in the lingual direction.