Q. I have what seems to be a mean subtle toothache coming from an old root canal. All the dentists are saying that there is nothing wrong with that tooth. I desperation I have already removed the other suspect teeth form around this one (no 6 I believe, left) and now every doctors says that i must not loose this one. Is there such a thing as a mutated bacteria, when sealed in an airtight tooth that can poison you? I have earache, sore throat, and toothache but not a very clear one as the nerve had been removed. I can bite on that tooth but if I touch around the roots it seems to be sensitive inside. No abscess and nothing bad on xrays. Even the enthodontist confirmed that. Please advise whether there is a the possibility of a mutated bacteria. Do they really exist and what cna be used for treatment? Ordinary antibiotics did not make difference.