My recommendation will include referral to specialist unless it happened with the specialist to check the prognosis(success ratio). I have seen good success with perforation treatments depending upon location. Newer materials have good success rate.
Perforation Cure in Anterior Tooth During Root Canal?
Doctor Answers 2
Needs to consult with Root canal Specialist(endodontist)
Depends on the location
Depending on the location of perforation, you can have it repaired. It the perforation is too far below the crest of the bone, then the only alternative is extraction. Hope this helps.