In the modern world, there are so many recent advances in diagnosis in conservative dentistry Endodontics. It is enhanced by newer technologies. The style of this improvement is targeted towards increasing the objectivity sensitivity and reproducibility of the pulp tests while decreasing the patient’s discomfort. Methods like Pulse Oximetry, Laser Doppler Flowmetry, Ultrasound Doppler, Dual Wavelength Spectroscopy, Photoplethysmography are being developed and evolved to get adapted to the current clinical setting which may be of great use to the modern endodontist. These new methods fulfill the necessity of choosing the best tools for a good diagnosis. The aim of this review therefore was to assess the utility of some devices and techniques utilized in endodontic therapy to make the correct diagnosis