It was at this point Hermione brought the memory of what just happened at the dinner table to the front of her mind so Dumbledore would see it and nothing else. He looked carefully at her memories and simply smiled. This had become a weekly thing now, and she only noticed what Dumbledore was doing shortly after she started learning her Occlumency because she could feel him pushing to get into her head. That's when she realised he had always been doing it, and was doing it with everyone in the school. The rest of them would have not started learning this kind of magic so wouldn't be able to feel Dumbledore doing it.