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• nerve
  

  nerve tissue that conveys sensation, temperature, position information to the brain

• nerve (root) canal
  

  nerve (root) canal dental pulp the internal chamber of a tooth

• nightguard
  

  nightguard acrylic appliance used to prevent wear and temporomandibular damage caused by grinding or gnashing of the teeth during sleep

• nitrous oxide
  

  nitrous oxide a gas used to reduce patient anxiety

• Novocain
  

  Novocain older brand name for a local anesthetic, currently replaced by safer, more effective agents

• NSAID
  

  NSAID non steroidal anti inflammatory drug, often used as a dental analgesic