Periodontitis is a chronic infection that results from the interaction of periodontopathogenic bacteria and host inflammatory and immune responses and is the most common bacterial infection worldwide. Estimates reveal that 10-15 % of adults have advanced periodontitis, and periodontal disease can contribute to widespread oral health dysfunction and enhanced susceptibility to other systemic diseases (Pussinen et al. 2007). | Clive Oxenden Christina Latham-Koenig with Jane Hudson Study Link New ENGLISH FILE Upper-intermedic Workbook elt englishfile upper-intermediate OXFORD Clive Oxenden Christina Latham-Koenig with Jane Hudson New ENGLISH FILE Upper-intermediate Workbook Paul Seligson and Clive Oxenden are the original co-authors of English File 1 pub. 1996 and English File 2 pub. 1997 . OXTORD UNIVERSITY .
