Edwin has had cross bite since he was little.  His top baby teeth (Fig.2 (when the kid opens his mouth lightly): A, B) are behind the bottom ones (at 8.5 years). This alignment causes abnormal wear and tear of the top baby teeth before their fall out.

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Xin Wei, DDS, PhD, MS 1st edition 08/09/2014, last revision 08/09/2014