Use a grout saw to remove the loose or damaged grout in between the tiles.
Shower tile grout repair.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
Be careful to avoid damaging the tiles.
Gently run the grout saw back and forth along the grout seams.
Grout is available as sanded or unsanded.
If the space is larger than 1 8 of an inch use a sanded grout.
Lightly dampen the sponge.
Step 3 clean the seams.
Use a spray bottle and some cold water to wet the areas where you removed the grout.
Then take an old toothbrush and scrub the seams.
If the width is 1 8 of an inch or smaller use an unsanded grout.
Match the caulk at most tile specialty shops you can get or order sanded caulk most floor grouts are sanded that will closely match your existing grout color.
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Measure the space between the tiles.