Final answer:
Discussing a celebrity's visit to a dental office might breach confidentiality and is generally discouraged in terms of professional conduct for medical professionals.
Step-by-step explanation:
Mentioning that a celebrity was in the dental office earlier in the day while talking with a friend at lunch at a restaurant could touch on issues of privacy and professionalism. Although it may seem harmless, discussing patients, celebrity or not, could violate confidentiality rules if any identifying information is shared. As part of professional conduct, it's important for all medical professionals, including dentists, to maintain patient confidentiality.
In literature, characters like McTeague, who is both a dentist and the protagonist in Frank Norris's novel, might find themselves in situations where the privacy of their patient's encounter is a pivotal plot point. It can provide context or drive a narrative, but in real life, such information should be safeguarded.