Objective: Analysis of a number off actors related to dental caries of workers the Thong Nhat Coal Company, Quang Ninh. Subjects and methods: The cross-sectional studies on 403 workers are directly and indirect workers in Thong Nhat Coal Company - Cam Pha town, Quang Ninh from 12/2009 to 10/2010. Results: Incidence of caries in the group of direct workers is 7.2 percent. Incidence of caries in the group of indirect workers is 12 percent. Incidence of caries in workers work from 5-10 years is 8 percent. Incidence of caries in workers work from 10-15 years is 12.1 percent. Incidence of caries in workers work 15 years is 5.4 percent. Conclusion: There is no relationship between working age, and education, health communication oral hygiene with dental caries in workers of Thong Nhat Coal Company, Quang Ninh. Oral hygiene and smoking habits has no relationship with dental caries in workers of Thong Nhat coal company, Quang Ninh.