Figure 3. The process of extracting the supernumerary tooth. (A) Oral surgical area. (B) Oral incision. (C) Cut and flip the flap according to the designed incision. (D, E) Exploring the position of ST under DNS guidance to determine the range of bone opening window. (F) Expose ST after removing the overlying bone of ST. (G–I) The distal part of ST’s crown is closely adjacent to the mesial root of the left mandibular first molar, and the mesial part of ST’s crown is also closely adjacent to the lingual side of the root of the left mandibular second premolar. Accurate bone removal is performed under real-time dynamic DNS guidance to avoid damaging the roots of the left mandibular first molar and second premolar (green represents safety, yellow represents proximity, red represents danger and simultaneous display of distance to the security edge). (J) ST was extracted through the elevator. (K) Clean and rinse tooth extraction socket. (L) Suture and close the wound, with ST removed in the lower left corner.