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What is a root canal?

What is a root canal? Here are some definitions.

Noun
  1. The hollow part of the root of a tooth containing the nerve and blood vessels.
  2. (dentistry) A surgical operation on a root canal, typically filling it with gutta-percha.
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Examples
You don't want to be at the dentist and have the novocaine wear off halfway through a root canal, do you?
You take the guy to the dentist's office at 3 a.m. for a root canal, and he's back on the ice the next night.
It is a further object of this invention to provide for a root canal sealer which uses triiodomethane as an antimicrobial agent.
This laser is commonly used for dental procedures such as root canal therapy.
Afterwards, the tooth is sealed by placing a rubbery filling into the root canal.
Suddenly you're forced to estimate summer child care expenses and what part of your upcoming root canal isn't covered by insurance.

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