Correlation between dental caries experience and the level of Streptococcus mutans and lactobacilli in saliva and carious teeth in a Yemeni adult population

ObjectiveThis study aimed to determine the relative amounts of Streptococcus mutans (SM) and lactobacilli (LBs) and their relationship with dental caries among a Yemeni adult population.ResultsA positive correlation appeared between SM and LB counts from saliva and caries tissue samples and the decayed, missing and filled teeth (DMFT) score (p<0.05). There was a significant correlation between SM and LBs in caries tissue (p<0.05). However, there was no significant difference between SM and LBs isolated from saliva samples (p>0.05). The number of SM and LBs in subjects with active caries was significantly higher than that in those without active caries (p<0.05). There was no significant difference between the daily habits and SM and LB or DMFT scores (p>0.05), except for a significant difference between brushing frequency and DMFT score (p<0.05).