在工业生产中，工人及技术人员接触某些有毒物质而发生职业病。常表现为某种元素的慢性中毒，而其病变在口腔中多有相应的改变。因此，观察口腔，往往可以发现职业中毒的迹象。例如：汞中毒日内有金属味、唾液增多；常发生牙周炎、牙龈红肿、呈青紫色、易出血、咀嚼时牙齿酸痛 In industrial production, workers and technicians have exposure to certain toxic substances and occupational diseases occur. Often manifested as chronic poisoning of an element, and its lesions in the mouth more than the corresponding changes. Therefore, the observation of the oral cavity can often find signs of occupational poisoning. For example: mercury metal poisoning days, increased saliva; often periodontitis occurs, swollen gums, was purple, bleeding, chewing teeth pain