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If forced to come forward during orthodontic treatment, several negative effects may result: reduced bone surrounding the roots, sometimes called "receding gums".
Second, the large molars are tipped towards the tongue by the surrounding muscles - producing a narrow arch form. Since the biting (chewing) forces are now hitting tipped teeth, the teeth will continue to tip more and more towards the tongue. Consequently, the arch becomes narrower and narrower as the young growing patient becomes an adult. 
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