Trigeminal cranial nerves are desensitized when a dentist gives a shot of Novocain which prevents pain impulse transmission from the teeth and gums.
Trigeminal nerves are the one responsible for the transmission of pain, touch and temperature related impulses form the face to the brain. One trigeminal nerve runs to the right side of the head, while another nerve runs to the left.
Novocain is the local anesthesia that causes the loss of feeling from the skin and mucous membrane. Currently the anesthetic has been discontinued from usage because cases were obtained where the patients suffered from allergic reactions due to it.
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