A 39-year-old man presented with abdominal pain and constipation. Physical examination revealed a gray line along the margins of the lower gums. Evaluation confirmed an elevated blood lead level. | Helmich, F., & Lock, G. (2018). Burton’s Line from Chronic Lead Intoxication. New England Journal of Medicine, 379(19), e35. https://doi.org/10.1056/NEJMicm1801693