To keep a toilet from rocking, you should use plastic toilet shims (specifically designed leveling shims) tucked evenly into the gaps between the ceramic base and the finished floor. Avoid using wooden shims, which can absorb moisture, rot, and compress over time. Once the toilet is fully leveled and stable, you can conceal the shims and seal the perimeter using mold-resistant silicone caulk, leaving a small gap at the back for a weep hole. Verification: Check that the toilet base makes solid contact with all shims and does not wobble when pushed.
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