nerve: tissue that conveys sensation, temperature, and position information to the brain.
nerve (root) canal: dental pulp; the internal chamber of a tooth where the nerves and blood vessels pass.
night guard: a removable acrylic appliance that fits over the upper and lower teeth used to prevent wear and temporomandibular damage caused by grinding or gnashing of the teeth during sleep.
nitrous oxide: a gas (also called laughing gas) used to reduce patient anxiety.
NSAID: a nonsteroidal anti-inflammatory drug, often used as a dental analgesic.
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