while this guy's analysis is probably right, and useful to me, i'm not sure why he would refuse to paint over them. i mean, i'm not going to argue with him. but, i think i'm going to need to find a dentist #5 that is willing to do a bonding. i may be back to finances - it may be the case that he was at least honest with me, but isn't willing to do work at a lower pay grade.
i'm making progress...
there are places that explicitly advertise "deep cleaning". i should give one of them a call tomorrow.