AUTHOR(S): Divya and Puneet Sehgal

ABSTRACT:Bacteria constitute an important part of our environment .Indeed life without bacteria would be impossible. If we take about bacteria in context of periodontal disease, these microorganisms exert their effects directly by causing tissue destruction or indirectly by stimulating or modulating the host--tissue response. The pathogenesis of periodontal disease involves a complex interplay b/w bacterial pathogen and the host tissue. Recent investigations have revealed that not all strains of specific microbial species are equal in their capacity to cause disease and not all hosts are equal in their susceptibility.

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