Prevalence of oral diseases (2019) Estimated prevalence of untreated caries of deciduous teeth in children 1-9 years: Rate of children between 1-9 years who have untreated caries in one or more deciduous teeth. Untreated caries is defined as a lesion in a pit or fissure, or on a smooth tooth surface, that has an unmistakable cavity, undermined enamel, or a detectably softened or floor or wall (coronal caries), or feels soft or leathery to probing (root caries).