This question is more than six months old, so the information in the answer may no longer be accurate.
Visitor asks:

Dear Sir/Madam,
what is wrong with a tooth that has supposedly been "dead" for a year, yet during root canal cleaning I react as if someone were poking a live wound with a sharp object?
Thank you and kind regards.

Dentist Tomaž Rotar answers:

Dear Sir/Madam!

The pain is caused when the endodontic file touches the periodontal ligament, the membrane that also surrounds the root tip and thus determines the length of the canal. Contact with a responsive periodontal ligament is a good way to check the length of the root canal, and its responsiveness is a sign that the disease process has not yet spread significantly to the periodontal tissues around the root tip.

Have a nice day!
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