There are a few probable causes but before you tear up the tile and start over try this quick cracked grout fix.
Floor tile grout replacement.
Choose the correct type of grout based on the width of your tile joints and where the repair is being done.
Remove all the loose and cracked grout with a grout saw or dremel tool and completely vacuum out the gaps.
If the space is larger than 1 8 of an inch use a sanded grout.
How to repair broken grout on tile floors.
Properly installed tile and grout should allow for the normal expansion and contraction of tile flooring.
For much larger areas use a rotary tool image 2.
For small areas use a grout removal tool with a carbide blade.
Fortunately you can easily remove damaged grout and replace it with new grout so your tiles look brand new again.
If the width is 1 8 of an inch or smaller use an unsanded grout.
Make sure the bit is the right size for the space between the tiles and adjust the bit to the proper depth.
Learn how to remove old discolored tile grout and replace it with new tile grout from home improvement expert ron hazelton.
In short sanded grout should be used if the space between tiles is more than 1 8 of an inch but not on metal glass or marble tiles and unsanded grout should be used if the width is less than.
If the grout between your tiles is damaged it can make your tiles look dull and old.
Work slowly image 3.
Is the grout between your floor tiles cracking or worse crumbling away.
When that day comes remove the grout and replace it to rejuvenate the installation and make the surface gleam.
Remove and replace grout even the best tiling jobs show their age eventually.
The blade is harder than the grout and will cut it away image 1.
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Measure the space between the tiles.
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Grout is a cement based paste that s used to fill the gaps between tiles.