Abstract :Nonsurgical therapy aims to eliminate bacteria within the microbial biofilm and calcified biofilm microorganisms from the tooth surface and adjacent soft tissues. Complete elimination of such pathogenic microorganisms is probably over-ambitious. However, absence of inflammation in the periodontium results in beneficial clinical changes.In addition, nonsurgical therapy aims to form an environment during which the host can more effectively prevent pathogenic microbial recolonization using personal oral hygiene methods..The various methods utilized in nonsurgical therapy, like hand instrumentation, ultrasonic and sonic scalers, and ablative laser therapy.