If this happens as you chew down on the tooth, it could be a galvanic effect with the opposing tooth. This occurs when two different metals are in close proximity and create the potential for electric current to be generated. If the crown covering the root canal is gold and is made to contact another metal (like a silver/mercury amalgam filling), you will possibly experience an electrical current. Many dentists are in denial of basic physics and chemistry because they are trained very narrowly in their field.Have the metal filling replaced with a resin or porcelain filling. It's a good idea to have the mercury out anyway.
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