Roddy,
A bad taste in the mouth sounds innocent, but it can be caused by a majority of more serious issues.. One may be infected sinus's, another could be problems with the stomach, such as dyspepsia. Do you suffer with heartburn, or do you have pain over one side of your face?
Please describe the specific taste if you can, because metalic taste can also be indicaative of a lung problem.
Write back and give more specific details.
I agree it doesn't seem like a tooth, especially one that has been root canaled, it is dead..
good luck,
Jaspara
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