S. sanguinis is a normal inhabitant of the healthy human mouth where it is particularly found in dental plaque, where it modifies the environment to make it less hospitable for other strains of Streptococcus that cause cavities, such as Streptococcus mutans.
S. sanguinis is a bacterium found naturally in healthy mouths, especially within dental plaque. It helps maintain the balance of bacteria in the mouth by inhibiting the growth of harmful bacteria like S. mutans, which are associated with tooth decay.