DR ARMEN TARANYAN / SCIENCE PHOTO LIBRARY DR ARMEN TARANYAN / SCIENCE PHOTO LIBRARY
Close-up of the mouth of a patient with an underbite, showing the lower teeth overlapping the upper teeth. This is a form of malocclusion, a misalignment between the teeth of the upper and lower jaws as they close. Malocclusion may be inherited, or the upper and lower jaws may be different sizes. Crowding of the teeth in the mouth may also cause the condition. Braces may be used to correct the position of the teeth and in cases of overcrowding teeth may be extracted. In extreme cases surgery to lengthen or shorten the jawbones may be necessary.
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