When Daniel is 5 years old, his baby teeth are in his mouth (including 4 top front ones: A, B in Fig.1 (X-ray)), while the permanent front ones are forming inside the gums (#1,2).  However, there is an extra tooth (green dashed line) next to one of the central incisors (#1, pink dashed line).  The extra tooth can be wrong in any sense.  It may be too small, abnormally shaped or bad in orientation, as will be mentioned below.  Red dashed line is a bone plate separating the nose from the mouth. 

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Xin Wei, DDS, PhD, MS 1st edition 10/25/2014, last revision 10/25/2014