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Workers in dentists’ offices may be exposed to numerous hazards, including solvents, infectious agents, mercury and ionising radiation. In this issue, Simning and van Wijngaarden review the epidemiological literature on cancer among dentists, with special attention to the possible effects of mercury and low-dose radiation.1 Although 19 studies were reviewed, most didn’t include information on occupational exposure. Dentists’ cancer rates were unremarkable overall but elevated risks were seen for some specific cancers, including those of the skin, brain and female breast. While exposures in dental work are a plausible cause, social class is also a risk factor. The authors conclude that conclusions are difficult in the absence of better exposure data—still a frequent problem in occupational epidemiology.
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Cleaning is a common occupation worldwide, especially for women, and recent research links some cleaning products and processes with allergic disease. Maçãira et al report on the prevalence of asthma, rhinitis and related
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