- Mismatch in the sizes of upper and lower jaws
"Projected upper teeth" results if the upper jaw is much longer than the lower jaw. "Reversed bite" results if the upper jaw is smaller than the lower jaw.
- Abnormal number of teeth
Normally one should have 28 permanent teeth (excluding the third molars). If the number of teeth is more than that, the jaw may not have enough space for all the teeth to align properly. If there are too few teeth, there may be spaces between the teeth and the teeth may look irregular.
- Mismatch in the tooth and the jaw sizes
If the tooth size is too big, the jaw size is too small, the jaw may not have enough space for all the teeth to align. If the tooth size is too small or the jaw size is too large, there will be spaces between the teeth and the teeth will look irregular.
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