Mutans streptococci (MS) are the primary cariogenic agents, and Streptococcus mutans and Streptococcus sobrinus are believed to have the closest relationship with human caries.
变形链球菌族(MS)是目前公认的致龋菌,其中与人类龋病发生关系密切的是变形链球菌和茸毛链球菌。
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Conclusion the main risk factors to primarycaries are the children 'life habits, birth status and parents' attitudes to the oral health.