To fix a rocking toilet on an uneven floor, start by hand-tightening the closet bolts on each side of the base. If gaps remain between the ceramic base and the tile floor, slide plastic leveling shims into the gaps until the toilet is completely stable and rigid. Use a utility knife to trim the exposed shims flush with the porcelain base, and seal the perimeter with mold-resistant silicone caulk while leaving a small gap at the back for a weep hole. Verification: Sit on the toilet or push against it to verify zero wobbling.
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