I can't drink cold drinks because I had a root canal on one of my back upper teeth and i looked on the inside and there was a dark line along the gum (inside) where the cap was put on. Scraped, nothing came off and I think it might be a separation in between the cap and my gm. Is this common? I thought, though, that when you have a Root Canal they take the nerve out. So why does it hurt anyway, if this is what it is? There's no pain otherwise
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