We're assuming what you mention about the recurring blister is possibly a fistulous tract. Obviously your dentist will figure that out.

And yes you're right, lingering sensitivity isn't necessarily a good sign about the success of your treatment. (This page discusses common signs and symptoms of failed cases.)

You simply need to appoint with your dentist and let them take x-rays and evaluate your tooth's current status. If a problem is found, the next steps simply depend on the nature of the issue identified. When retreatment seems appropriate, the procedure most often performed is simply repeating the same process as you've had before. Good luck.

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