The tooth next to the wisdom tooth on the left is leaking nerve, which is very painful, and the tooth attached to the upper mouth hurts.

Just pull out the wisdom tooth. It has no function at all, and it also affects the other teeth, which is the culprit and should be solved long ago.

adjacent teeth can be preserved as much as possible. Here, I would like to remind you of a conceptual misunderstanding. There are always people who think that teeth can be protected as much as possible, so they keep their teeth. The real meaning of tooth position preservation should be: functional teeth, through appropriate treatment, as far as possible asymptomatic preservation, and can exercise normal or at least some functions. In this sense, many teeth that can't be treated or controlled by inflammation will destroy the surrounding bone and even affect the adjacent teeth because of repeated inflammation. This kind of "guarantee" is better than not "guarantee". Doctors think that the inflammation of this tooth can be controlled through treatment to restore its basic health, and then they will try to keep it.

If the doctor thinks that your teeth can be preserved by root canal treatment (removing the infected pulp, then the nerves must be removed), then you should try your best to treat them and keep them.