Adolescent Humans 4 Saliva adolescent 4 human 4 saliva 4 Child 3 child 3 Chewing Gum 2 Dental Caries 2 Female 2 Male 2 Streptococcus mutans 2 Time Factors 2 Xylitol 2 Young Adult 2 chemistry 2 chewing gum 2 controlled study 2 dental caries 2 drug effect 2 female 2 isolation and purification 2 male 2 microbiology 2 randomized controlled trial 2 time factor 2 xylitol 2 young adult 2 Adult 1