Oral calculus in children.
D000293:Adolescent; D002140:California; D002648:Child; D003728:Dental Calculus / Q000453:epidemiology*; D003741:Dental Deposits / Q000453:epidemiology; D003753:Dental Health Surveys; D005006:Ethnicity; D006801:Humans; D044469:Racial Groups; D012959:Socioeconomic Factors