Dental lead, blood lead, and pica in urban children.

Lead storage in teeth was evaluated by examining the lead concentration in deciduous teeth of 32 children whose habits of pica and state of lead exposure had been studied when they were between 1 and 3 years of age. Concentratios of lead in their teeth depended on the reported amount of paint or plaster intake and the duration of exposure. The mean dental concentration of lead in exposed children was significantly higher than the mean value in 36 controls, who presumably did not have undue exposure to lead. A difference in dental lead concentration related to living area was noted. The significant difference in lead content of teeth between the two groups, even though the concentrations of lead in blood at 8 years of age were similar, emphasizes the importance of dental lead measurments for retrospective studies of lead exposure.