Final answer:
A dentist may refer an HIV positive patient to a dental specialist when the patient needs specialized care.
Step-by-step explanation:
In most cases, a dentist may refer a patient who is HIV positive to a dental specialist when the dentist believes the patient needs specialized care. HIV patients may require specialized dental treatments or procedures due to their compromised immune systems. It is important for dentists to ensure that HIV positive patients receive the necessary care from specialists who have the expertise and experience in managing their specific dental needs.