Periodontist Email Lists:  Periodontists specialize in oral health care and are board-certified doctors. Dental implants can also be placed by a periodontist, diagnosing and treating periodontal disease (gum disease). Periodontal diseases include P. gingivalis, T. forsythia, and T. denticola. Without treatment, losing teeth and bone in the alveolar region is possible. One must have a dental degree to apply for the periodontology postgraduate program.