"Toller" wrote in message
...
I have oak floors. Nail heads come up, I push them down, and they come up
again.
I won't even ask why they come up, but just how do I keep them from doing
it.

Pull them and put in larger nails (thicker, longer?)? Some sort of glue?

Replace them. Pull a few (you can use a shim to prevent the pliers or
claw-hammer from marring the floor). Take them to a good hardware store.
They can sell you replacements.