I would not,
because I wouldn’t want to put them in an embarrassing situation. Everyone wants to make a new acquaintance feel at ease. If, later, they look in a mirror and notice something stuck in their teeth, they’ll probably react in one of several ways: “Oops! Got this thingy in my teeth but luckily she never noticed,” or, “Oh, how nice. She noticed but refrained from embarrassing me.” Also, the offending blemish may disappear before the acquaintance has even noticed it. With such possible scenarios, why bother drawing attention to it? Also, my goal with new acquaintances is to focus on the person and foster a smooth-flowing conversation. This should not be interrupted by upsetting remarks about a person’s appearance, such as “Excuse me, you’ve got something stuck between your teeth.” The person would become embarrassed and have to tend to their appearance, and subsequent interaction may be awkward. It would be an unfortunate faux pas to interrupt a conversation in such as way.
Lianne is a solicitor and a big fan of equestrian sports