I'm not sure what would be confusing. Unless they don't give sunglasses at the dentist where you live?
https://old.reddit.com/r/NoStupidQuestions/comments/n5uoc9/do_other_dentists_give_out_sunglasses_or_just_mine/
At dentists I've been to, they shine a bright light on your mouth so the dentist can see, and they have a pair of sunglasses that they give patients to wear (borrow) while they're doing stuff to block out some of that light, and I wear those. But if I was just going outside on a bright sunny day, or going to the beach or something, I wouldn't wear sunglasses, and I don't currently own a pair (but there might have been times when I was much younger when I wore them, I don't remember).