The essential points of orthodontic therapy for periodontally compromised patients may focus on what the effects of orthodontic movement is on reduced but health periodontal tissue, and how orthodontists are advised to design the treatment plan. Recent studies gived an update of the therapeutic principle for periodontally compromised patients and trigger controversial topics. This paper are reviewed from 3 aspects: The different types of periodontal lesions teeth mobile, different teeth move for the rest of the way the influence of periodontal tissue, other special considerations.
