After looking up all the information, it seems like root canals should be pain free the day after. This worries the hell out of me. Whenever I apply just light pressure with my tongue, I feel the pain. Is there still hope it hasn't failed? Or is it common to have pain the day after sometimes?

I will make my dentist refund me if it has, or redo it for free. Its hard being a college student and paying a $800 bill out of pocket. (another $900 for the crown).

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