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In their Education article in the March issue (Occup Environ Med 2007;64:202–10), Koh and Koh interestingly propose that measurements of heavy metals (for example, lead and cadmium) in saliva may be a novel and promising approach to occupational health, revealing the patient’s risk of systemic exposure to toxicants. We would like to share our experience regarding the assessment of metals …
Competing interests: None declared.