Good morning. In ten minutes, I will take Frank to the dentist for some fillings, necessitated by his inadequate brushing and flossing. The dentist and staff will be grateful that I made Frank change his shirt and his underwear.
Feel free to let Frank know that you have a friend with many crowns, which is what comes after fillings. When I was young nobody explained that the fillings are always temporary. They need to be replaced every few years. Eventually you can no longer fill the cavity and you get a crown. And that will likely be replaced more than once also.
Unless he really likes Novocain and being drilled on, he should learn his lesson now.