The purpose of this study was to explore the range of threshold responses of dental pulp with irreversible pulpitis to stimulation caused by electric current. Nineteen participants, who came to an emergency Community health center with symptoms and diagnosis of irreversible pulpitis, participated in the study. All teeth in both jaws were included. After the procedure was explained and the participants signed informed consent forms, the teeth were isolated using cotton rolls and dried with compressed air. Medical conductive TENS gel (Dahlhausen, Njemačka) was placed on the target teeth and the electrode of the device was clamped. The participants were instructed to stop further increase of the electrical impulse when they felt any type of stimulus. The device VitaliScan vs-02 (E-lab, Zagreb Hrvatska) was used. The measurement was repeated 3 times and was written in the appropriate table. The obtained data were analysed using SPSS 17.0. (SPSS Inc., Chicago, Ill., USA). The results showed that it is possible to measure threshold stimulus of dental pulp in irreversible pulpitis. The mean thresholds for the maxillary molars are 42,92 µA, lower molars 38,79 µA, lower cannines and premolares 20,42 µA. In pulp necrosis the values are above 250 μA.