Traditional diagnostic procedures for periodontal diseases, such as probing and radiographic assessment, provide information on previous disease experience but not of present site-specific disease activity. Recent advances in computer-based image acquisition and processing techniques has increased the importance of radiography in periodontal diagnosis. The era of digital imaging has commenced in dentistry with definite diagnostic advantages. Significant dose reductions and image quality enhancement are among major advantages. The aim of this paper is to review the the imaging techniques being used in periodontology. There is a bright future of imaging technology on the horizon of dentistry.