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Dental caries development is considered to involve a triad of indispensable factors: bacteria (dental plaque), carbohydrates (the diet), and susceptible teeth (the host) Since earlier studies the mutants streptococci are considered major etiologic agents in dental caries in humans. Strpetococcus mutants is a Gram- positive oral commensally species that is commonly recognized to be one of the primary organisms associated with the development of dental caries (cavities). In the study are included 240 children of pre...