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Periodontists perform thorough clinical examinations, using calibrated periodontal probes to measure periodontal pocket depths and the "attachment level" of periodontal tissues. They check for gingival bleeding, evaluate the amount of plaque and calculus, and assess tooth stability. They also take X-rays to see if the patient has bone loss from past periodontal disease. Periodontists may do tests to find out which types of bacteria are involved.