Can you tell me about post op paresthesia (numbness) for an extensive time after dental treatment?

Vague explanation: What is extensive time? What procedure was done? What did your dentist or surgeon say? What therapy was tried to alleviate the paresthesia? Which area of your mouth? What caused the condition (injection/extraction/infection)? Your dentist/surgeon should have been immediately advised of the problem... let them know so that you can be evaluated.

Paresthesia also: called oral sensory function can occur following restorative and surgical dental procedures. Even administration of local anesthetic could be a cause of the paresthesia. The bottom line, paresthesia is a nerve disorder and should be treated ad a neuropathy. If there is no dysesthesia present the treatment is "tincture of time".