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we're lucky, I suppose, we don't get a lot of pain - I have an achy breaky hip that doesn't like being slept on and knees that don't do anything much since a car hit them, and we both get occasional headaches from twisting our necks while asleep. But nothing too terrible.
I have however had two root canals done where the anaesthetic didn't work. Those weren't nice. One dentist didn't believe me, which made it worse; the other realised it was going to happen, warned me, and promised to be as quick as possible; somehow that wasn't nearly so bad.