Which of the following can lead to chronic mercury poisoning?

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Swallowing mercury during the removal of old amalgam fillingsExposure through the skinInhalation of mercury vaporsAll the above methodsNone of the above

Explanation

Chronic mercury toxicity can occur through multiple routes including swallowing mercury particles during amalgam removal, skin absorption, and breathing in mercury vapors. Therefore, all these exposure pathways contribute to mercury poisoning.