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Periodontal disease refers to any pathological state in the periodontium. It is a progressive and relentless, usually non-regenerative and incurable disease. If treated properly, periodontal disease can be managed but we are better to think of prevention rather than of cure. Prevention and treatment depend on a thorough understanding of the relationship between the etiologic factors and the pathogenesis of the disease. In very simple terms, periodontal disease is a bacterial infection. The bacteria reside in a complex slime on the tooth surface known as plaque.