Dental caries is the result of bacterial metabolic activity in dental biofilm with the bacterium Streptococcus mutans, identified
as the primary etiological factor for dental caries and Lactobacillus plays an important role in the progression of the disease. The
purpose of the study was to evaluate the level of cariogenic bacteria, S. mutans and Lactobacillus in 30 children and their respective
mothers. Children affected with dental caries had high levels of Streptococcus mutans in relation to children free of dental caries
(60% and 20% respectively), however, the difference was not significant for Lactobacillus. Both children with dental caries and
without dental caries had mothers with high levels of Streptococcus mutans.