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Cure for the Tooth-ache.-By mistake it has been ascerained that nitric acid is sure cure for most cases of tooth-ache. A young physician who had been using sulphuric acid, which afforded partial relief on one occasion, through mistake, applied nitric acid and to his surprise the pain ceased im- mediatey; since which time space of three years, he has not suffered from the tooth-ache. The best mode of applying it is by wrapping lint round a probe, and moistening it little with the acid. Care should be taken not to touch the other teeth the gums or the cheeks.