Yes, it is normal to shim toilets. If it has been rocking, there
is a chance it has affected the wax ring seal. Plumbing supply
houses have some small white plastic shims, just made for the
circumstance. You can grout or caulk the resultant gap. Do not
grout or caulk the back so that if there is a failure, you can see
the leak.
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Keep the whole world singing. . . .
DanG


"jch" wrote in message
...
A friend asked me for advice but not really having any
experience leveling
toilets I thought I'd ask someone here. Seems he has a basement
bathroom
with a wobbly toilet. He wondered if he could put shims in place
to stop the
movement. It sounded like this could work but I wasn't sure
about long term
stability. Any suggestions? Thx.