The ideal overjet for a normal occlusion is:

• A. 0-1 mm
• B. 2-4 mm
• C. 5-7 mm
• D. 6-8 mm

Answer: (B)

In normal occlusion, the upper front teeth should sit slightly in front of the lower front teeth, creating a small horizontal distance called the overjet. This distance is measured with the jaws closed and the teeth in contact, and an ideal range is about 2–4 mm. This amount provides adequate incisal guidance for functional biting, protects the lips, and reduces the risk of trauma while maintaining esthetics and stable alignment. If the overjet were as small as 0–1 mm, the bite becomes almost edge-to-edge and can be less stable; if it were much larger, around 5–7 mm or 6–8 mm, that indicates protrusion and a tendency toward malocclusion with higher trauma risk. Therefore, 2–4 mm best fits normal occlusion.