Child 2 Child, Preschool 2 Dental Caries Dental caries Female 2 Humans 2 Male 2 Saliva 2 Streptococcus mutans 2 child dental caries 2 female 2 human 2 male 2 preschool child 2 saliva 2 Adolescent 1 Antibodies, Bacterial 1 Bradford reagent 1 Cross-Sectional Studies 1 Dental Plaque 1 Enzyme linked immunosorbent assay 1 Enzyme-Linked Immunosorbent Assay 1 Immunoglobulin 1 Immunoglobulin A 1 Immunoglobulin A, Secretory 1 Scanning electron microscopy 1 Severity of Illness Index 1 Streptococcus sanguinis 1 Streptococcus sanguis 1