whole point of having to do a root canal is when the cavity has gotten so bad without treatment that it infects the entire tooth dentine and that begins to decay, of course there's a nerve inside the tooth that feels the decay creeping in which hurts like hell, of course this neccesitates a root canal to hollow out all the decay, in the process annihilating the nerve as well, and nerves tend to complain when they're put in a blender, so heavy painkillers are the order of the day until that nerve shuts up
of course that nerve attaches to the maxillary nerve which is one of the few nerves that enter the brain directly, no spinal cord as a buffer to inhibit the signal, the pain goes directly to the sensory cortex, which enchances the experience
yea, it's far more interesting observing the dentists than having it done, but as a future dentist myself it's my business to know (and score reccomendation letters to med school)
nice thing about a root canal is that that tooth is now a solid mass of ceramic and enamel, no way it's ever going to bother you again
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