Is the use of neither-nor grammatically correct in this sentence?

Question

Is the neither/nor structure used correctly in the following sentence?

This treatment can’t be used if the root is too curved or it has got a tiny root canal that would not provide the needed space for the post. Neither when the fracture extends below the gum line nor for a tooth that has multiple canals.

I am asking this because I have learnt how we can use neither/nor before nouns or adjectives eg. “Neither Tom nor Jenny came to the party” or “this place is neither nice nor safe” but I'm not sure if I can use the structure together with 2 clauses?

Answer 1

The second part isn't a sentence. You need to say something similar to,

Neither can it be used when the fracture extends below the gum line nor for a tooth that has multiple canals.