I started using Uncle Harry's, after having a sensitive crisis and being told by a dentist that I would need extensive crowns. That was... 7 years ago? Got one

I started using Uncle Harry's, after having a sensitive crisis and being told by a dentist that I would need extensive crowns. That was... 7 years ago? Got one cavity done last year. Surprised no one else had mentioned them. American, reputable, easy to find.