In the mouth, the nerve is located in the pulp, which is the soft tissue that is at the center of each tooth. When the pulp is irritated, or there are too much friction and stimulation, it can lead to pain in the nerve. The pain can be dull or sharp, most times making the tooth and gum overly sensitive and sore.
There are two categories of tooth nerve pain, they include dentinal sensitivity and pupal sensitivity. The main difference between these two is that with pupal sensitivity the pain is focused on one singular tooth, while with dentinal sensitivity, more than one tooth is affected.