Root canal 3 times

I had a root canal in Feb of last year but tooth was still painful after several months. Returned to dentist and he discovered he missed filling the tip of the root so he redid root canal. Another three months passed and tooth was still painful. He sent me to a specialist and the endo found another root that didn't show in dental xray. This endo redid root canal and cut off part of the tip to eliminate root branch. Now, six months later, this tooth area is still sensitive. I decided to get another opinion and went to another dentist. She put antibiotics around the gums but that didn't help. She recommends extraction because of chronic irritation. Does this seem like a failed root canal and does it seem pausible that now I can't save the tooth? I've spent much $ trying to save this tooth.

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