When Alice is 11 years old, two of her baby central incisors have not fallen out (Fig.1: A).  They are supposed to do so at the age of 8.

B: baby lateral incisor; C: baby canine; 1: permanent central incisor; 2: permanent lateral incisor.

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