In 3 months (wearing the removable appliance), the 2 adult front teeth (central incisors (#1 in Fig.10; 9 years 9 months) are indeed repositioned, but the adult lateral incisors (#2, just erupting) are inside the arch (cross bite).

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Xin Wei, DDS, PhD, MS 1st edition 08/09/2014, last revision 08/10/2014