Hay guys,I just got back from the dentist and I can still see some staining on my teeth, on the back side. Most of it is cleaned up, but not all.My teeth are healthy, gums are good, and the cleaning I get is generally OK but this is the second time not everything has been cleaned up.Just how clean is a regularly scheduled cleaning supposed to get you? I can't tell if the guy is being sloppy or if I am expecting too much from a twice-yearly cleaning.