The general causes of upper dental plexus injury are tooth disturbances and the periodontal tissues diseases, the pathology of maxillary sinus, various traumatically manipulations in the area of tooth and maxilla as well. The main symptom of upper tooth neural plexus injury is acute and chronic pain in the alveolar sprout of maxilla, gums or in the area of singly tooth, which rarely spreads into neighboring maxillofacial areas. The authors recommend that the acute pain syndrome would be called the inflammation of upper tooth plexus, and the chronic pain syndrome--plexopathia of upper tooth. Study presents the differential diagnosis according to character of facial pain syndrome and the data of sensority disorders research and investigation of pain thresholds as well. The recommendations for treatment tactic and methods of analyzed indispositions are suggested.