A New York periodontist is a dental specialist that has not only completed 4 years of dental school, but has also completed an additional 3 years of specialty training in diagnosing, preventing and treating gum disease. New York periodontists can also place dental implants as well as perform cosmetic periodontal treatments. A periodontal evaluation is sometimes the only way to detect gum disease. Your New York dentist can refer you to a periodontist, or you can make your own appointment for an evaluation.