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Oral Care Guide For Teens - Knowing Your Teeth - The Occlusion

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Animation showing a normal bit

The occlusion is determined by the placement of upper and lower jaws. In a normal occlusion, the lower front teeth should touch the inner surface of upper front teeth. One-third of the outer surface of lower front teeth should be covered by upper front teeth. The outer surface of lower front teeth should be 2mm to 4mm apart from the inner surface of upper front teeth.

Animation showing projected teeth.

If the upper jaw bone is exaggeratedly bigger than the lower jaw bone, or the upper front teeth are projected more forward than the lower front teeth, it will result in ‘projected upper teeth’.

 Animation showing teeth with reversed bite. However, if the lower jaw bone is bigger than the upper jaw bone, or the lower front teeth are projected more forward than the upper front teeth, it will result in ‘reversed bite’.
Explanation of WCAG 2.0 Level Double-A Conformance