If the space is larger than 1 8 of an inch use a sanded grout.
Shower tile grout repair.
Use a grout saw to remove the loose or damaged grout in between the tiles.
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Gently run the grout saw back and forth along the grout seams.
Step 3 clean the seams.
Use a spray bottle and some cold water to wet the areas where you removed the grout.
If the width is 1 8 of an inch or smaller use an unsanded grout.
Measure the space between the tiles.
Lightly dampen the sponge.
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Allow the grout to begin to dry for about 10 minutes or until it resembles stiff putty then wash the surface of the tiles with a grout sponge to remove the excess grout.
This fix is only practical for interior tile floors and when the gaps between the tiles are 1 4 in.
Be careful to avoid damaging the tiles.
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.