During normal growth and development, the upper and lower jaws, along with the teeth, grow in harmony with each other. This results in facial symmetry and proper alignment of the jaw bones and teeth. The facial profile appears straight and normal.
Although the facial structures and jaw bones are in a correct relationship to one another as seen in these diagrams, in many instances the teeth may be misaligned. This type of condition is known as a Class I malocclusion, where the jaws are correctly positioned, but the teeth may require treatment for problems such as: crowding, tipped teeth, rotated teeth, missing teeth, cross bites or extra spacing. If left untreated, these conditions can lead to gum, bone and jaw joint problems. Orthodontic treatment is recommended to correct Class I malocclusions.