How to Repair Grout That's Cracking (DIY) | Family Handyman
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. Pro tip: This fix is only practical for interior tile floors and when the gaps between the tiles are 1/4-in. wide or less. ⓘ.