Root canals that I've had usually hurt or are sore for a couple of days, depending on how bad the tooth was before the procedure. It has something to do with the connective tissue attached to the tooth, I've been told Sometimes, I have a wierd taste for a couple days after too, but more wierd than bad. Sometimes when I would rub my tongue over the tooth, I would have a sharp, quick pain, but it was gone by the time the tooth was finished.
It sounds like there's a possibility some infectious tissue might have been left behind. I know when the dentist opened my last tooth(for a retreatment and I had a crown too)the smell was pretty foul from the infection.
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