Overjet (Class II, Division I Malocclusion):

Pre-treatment: A big overjet greatly increases the risk of injury to the upper front teeth because they are so prominent. Shortly after this picture, this patient fractured his upper left incisor.

Post-treatment: Fortunately, the upper left incisor was repaired nicely and did not require a root canal. Risk of future injury was greatly reduced as the teeth now have the proper overjet and are much less prominent.