The 2ne online study club of the LSP was animated by Pr. Ian Needleman from UK. The LSP prepared a program of webinars involving variable topics.A part of our scientific activities is focused on the new classifications of periodontal and periimplant diseases. One of our targets is to help Lebanese dentists to integrate this new classification based on staging (indicating the severity and complexity of management ), and grading (indicating the risk of rapid progression), in their daily practice. Pr Needlman is a professor of periodontology and evidence -informed health care in UCL Eastman dental institute. He was among the workgroup 2 that implement the new classification of periodontal disease. In his presentation he highlited that this new classification requires a modification of the current way of thinking to optimize diagnosis in clinical practice and education. He illustrated step by step decision making algorithms that guide the clinician and the academician to correctly assign cases to the correct periodontal diagnosis. A panel of discussion concluded the webinar.