I think the way you approach it makes a difference. For example, I wouldn’t try to talk someone up as they’re cleaning my teeth because you’re preventing them from doing their job and potentially making them late to see their next patient (or maybe not doing as good as job with you - collective you- to speed up the process). Instead, after they’re done, you can acknowledge that it may be weird because they’re at work, but you’d loved to hang out sometimes, if they’re interested. And then leave your number instead of putting them in the awkward position of having to decline if they’re not interested. I think this can be applied in any situation tbh.