Yes, shimming a wobbly toilet is standard practice and an effective temporary or permanent solution to stabilize the porcelain bowl and prevent it from rocking. Shifting back and forth puts stress on the fragile ceramic base and breaks the watertight wax ring seal underneath, which leads to leaks. However, do not simply overtighten the floor closet bolts to stop a rock, as this can crack the porcelain base. Instead, slide plastic toilet shims evenly into the gap beneath the base. Verification: Press firmly against the sides of the toilet bowl to confirm it remains completely rigid without movement.
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