"Licensure and certification. Three States–Kentucky, South Carolina, and Texas–require a dental laboratory to employ at least one Certified Dental Technician in order to operate. This certification is administered by the National Board for Certification in Dental Laboratory Technology (NBC) and the requirements are discussed under Certification and Advancement. In Florida, laboratories must register with the State and at least one dental technician in each dental laboratory must complete 18 hours of continuing education every two years."
From the Department of Labor