I have a tooth that hurts so bad but i've already had a root canal and crown put on it less than a year ago?

My bottom tooth on the right side, the one before my wisdom tooth is killing me. I've had a root canal and a crown put on it in the past year. It hurts to eat, to talk, to spit, to bite. It's a real dull pain and it goes all the way up to my ear. At this point i don't know what else can be done to it... show more My bottom tooth on the right side, the one before my wisdom tooth is killing me. I've had a root canal and a crown put on it in the past year. It hurts to eat, to talk, to spit, to bite. It's a real dull pain and it goes all the way up to my ear. At this point i don't know what else can be done to it considering it's dead and has a crown....does anyone know?
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