Final answer:
OSHA requires dentists to offer and pay for the Hepatitis B vaccine for their employees.
Step-by-step explanation:
The vaccination that OSHA requires every dentist to offer and pay for their employees is the Hepatitis B vaccine. The Occupational Safety and Health Administration (OSHA) mandates that all healthcare employers, including dental practices, provide the Hepatitis B vaccination to employees who have potential exposure to blood or other potentially infectious materials. This vaccination helps protect against the Hepatitis B virus, which can be transmitted through contact with infected blood or bodily fluids.