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The oral cavity harbors a diverse array of bacterial species. There are more than 600 species that colonize in the oral cavity. These include a lot of organisms that are not commonly known to reside in the gastrointestinal (GI) tract and also are more familiar: Lactobacillus acidophilus, Lactobacillus casei, Lactobacillus fermentum, Lactobacillus plantarum, Lactobacillus rhamnosus, and Lactobacillus salivarius. The balance of all these microorganisms can easily be disturbed and a prevalence of pathogenic organisms can lead to various oral health problems including dental caries, periodontitis, and halitosis.