Final answer:
When a dental health care worker infected with HIV or HBV experiences a risk exposure, they must notify their supervisor or the appropriate authority.
Step-by-step explanation:
When a dental health care worker infected with HIV or HBV is exposed to a risk, they must notify their supervisor or the appropriate authority. This is important because it allows for proper management and follow-up actions to be taken to ensure the safety of both the worker and the patients. In the case of the hospital mentioned in the provided information, they contacted all the patients the infected worker had come into contact with and had them tested for HIV to minimize the risk of transmission.