They are commonly sold at home centers, hardware stores, and restaurant supply stores.

Wood shims are not recommended because they can compress over time and are vulnerable to moisture damage.

If a bolt is loose, tighten it slowly just until it is snug.

White ceramic toilet in bathroom seen from above

The Spruce / Sarah Lee

Check the other bolt to verify it is equally snug, then test the toilet for rocking.

If it still rocks, proceed with shimming the base.

Look for Leaks

Confirm that yourtoilet is not leaking.

Materials and tools to fix loose, rocking toilet

The Spruce / Sarah Lee

Check carefully for water around the base of the toilet.

If water is not present, you could proceed with the repair.

In this case, you mustremove the toiletand replace the wax ring.

Pliers tightening bolts at bottom of white rocking toilet

The Spruce / Sarah Lee

It may help to rock the toilet from side to side.

Even a small space can be the source of the problem.

Insert the Shims

Level and steady the toilet by inserting shims into any gaps you’ve identified.

Blue cloth soaking up leaks from loose, rocking toilet

The Spruce / Sarah Lee

You may have to try them in a few different positions to properly level the toilet.

As you work, check the toilet for stability by sitting on the seat and rocking in all directions.

Repeat until the toilet doesn’t move in any direction.

Small gap under white ceramic toilet

The Spruce / Sarah Lee

Be careful not to cut into the flooring.

Add a dab of caulk below the shims to help them stay in place.

Let the caulk dry overnight before trimming the shims.

Shims added in toilet gaps closeup

The Spruce / Sarah Lee

Let the Caulk Dry

Allow the caulk to cure as directed before using the toilet.

Once it dries fully, your toilet should be as good as new.

The ring can corrode or break, loosening its grip on the bolts.

Shim being trimmed with utility knife under white toilet

The Spruce / Sarah Lee

It is safe to sit on a wobbly toilet temporarily.

The pipes can loosen further, and raw sewage can begin leaking out from the waste pipes.

This can also result in rotting floors, walls, and the growth of mold and mildew.

Caulk added to the base of white toilet

The Spruce / Sarah Lee

Atoilet tankshould not wobble.

The bolts connecting the tank to the bowl are likely loose.

Tightening them should stop the tank from wobbling.

Caulk drying around base of white ceramic toilet

The Spruce / Sarah Lee