男孩14岁，现在新西兰，左上尖牙唇侧横长（附图）经检查，门牙及侧切牙有吸收。（The CBCT saggital section at the mid tooth 21 slice shows that almost 2/3 ( 8.9mm/14.23mm = 63% ) of the facial root of tooth 21 has been moderately resorbed and that at the 22 site the resorption is minor at the apex region. ）请问1、门牙牙根会有哪些隐患？1、左上尖牙可以牵引矫正吗？