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Thanks - I knew about the destruction giving access to the tooth but why does sugar make the nerve hurt? if I put sugar on a cut in the skin where there are nerves it doesn't hurt any more than otherwise.
Thanks. Also, how can a tooth ache if it has had a root canal procedure? - apart from problems with bite? Can a microscopic crack make it ache, even if it has no nerve? And when a root canal is being done, can thye drill make microscopic cracks?
That does give me something to counter the dentist's claim that there can't be any ache because he's done root canals on all the roots.