Final answer:
A PCT should dispose of a used safety razor in a sharps container to ensure safety and compliance with biohazardous waste protocols.
Step-by-step explanation:
When a Patient Care Technician (PCT) assists a patient to shave using a safety razor, the appropriate disposal method for the razor is in a sharps container. Razors, needles, and other sharp objects can pose a risk of injury or infection to those handling the waste, so they are treated as medical sharps. These items are considered biohazardous and must be handled accordingly to prevent harm. Placing them in a sharps container helps ensure the safety of healthcare workers and sanitation personnel. It is important to note that the use of a regular trash bin, biohazard bag, or the patient's personal trash for sharps disposal is not proper practice and goes against safety protocols.