Periodontal diseases are among the most common chronic inflammatory diseases worldwide, whereas periodontitis is characterized by attachment loss and destruction of alveolar bone. The cardinal signs of inflammation are rubor (redness), tumor (swelling), calor (heat), dolor (pain), and functio laesa (loss of function). Some or all of these signs of inflammation can be seen in periodontitis cases, and advanced disease may cause tooth loss (Highfield, 20 09). Periodontitis continues to be a major global oral health problem that causes partial or complete edentulism in approximately 5%-20% of the adult population (Watt & Petersen, 2000). Apart from the functional problems, premature tooth loss is regarded as an important cause of decreased self-esteem. Moreover, restoration of lost teeth by dentures creates tremendous financial burden for the individual patient as well as for the government or insurance companies. Clearly, having access to proper information about periodontal disease etiology and its clinical signs is of vital