3. Extraction for vertical fracture
Sorry to hear about your son's tooth; unfortunately sometimes they crack without notice.
It depends on how and where the tooth is cracked. Also, since your son is 12 it is most likely a permanent (adult) tooth although it could be a primary (baby) tooth. If it is a small crack, it might be able to put some bonding or a filling on it. If it is bigger it might need a crown, or if it is cracked in a bad location, it might be the end of that tooth.
Marc D. Thomas, DDS
It could need anything from a restoration to a crown and root canal.