How long has it been since your bathroom or kitchen renovation? If you start to see some wear it could be because of the grout. Despite being professionally installed the grout will stain, crack, and become loose over time. For jobs that are poorly done in the first place, the grouting won’t likely last very long and you’ll have to take on the job sooner than you had expected. The good news is, you can DIY the grouting project. Removing and replacing the grout is an easy feat as long as you have a guide to help you. It is necessary to deal with the regrouting to restore the luster of your kitchen or bathroom making it worth the time and effort.

source: https://www.washingtonstatekitchenbath.com/articles/removing-tile-grout-is-easier-than-you-think/