Fig.3: X-ray for the top front teeth.  A: baby central incisor; B: baby lateral incisor; 1: permanent central incisor; 2: permanent lateral incisor.

In fact, braces are necessary to move the permanent central incisors forward (Fig.6 arrow) to create spaces for the permanent lateral incisors (2) to make appearance to the world.  When the permanent central incisors are in a normal position, they do not block the eruption of the lateral incisors (Fig.3).  C: baby canine.

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Xin Wei, DDS, PhD, MS 1st edition 10/19/2014, last revision 10/19/2014