Forensic odontology is among one of the growing branches of forensic medicine , which deals with handling of dental evidence and its evaluation of dental hard and soft tissue findings. The post – mortem interval (PMI) is a very crucial part of forensic investigation in most homicide and unwitnessed death, including hospital deaths. Most of the research has been focused on dental pulp for PMI investigation and lack of studies on periodontal tissues which can be a good source of DNA for PMI estimation. Periodontist are known to manage diseases associated with periodontal supporting tissues of teeth and implants, periodontal tissues are well recorded for its contribution in the field of forensic odontology in terms of sex determination, PMI estimation and age determination . This review article focuses on how a periodontist as a branch of dentistry can contribute to the field of forensic odontology in terms of PMI estimation.