Prevalence of dental caries among a cohort of preschool children living in Gampaha district, Sri Lanka: a descriptive cross sectional study

Prevalence of dental caries among a cohort of preschool children living in Gampaha district, Sri Lanka: a descriptive cross sectional study斯里兰卡甘珀哈区学龄前儿童队列中龋齿（dental caries）的患病率：一项描述性横断面研究