Is it normal to look at someone's mouth while talking?
Yep.Totally normal
Yes, it’s normal to look at someone’s mouth while they’re talking. People do it to follow what’s being said, and it doesn’t automatically mean you’re flirting or distracted.
People naturally shift their gaze around during a conversation, and looking at someone’s mouth can help you focus on their words or expressions. Some people also find it easier than holding eye contact the whole time.