We sealed ours
To answer your question, we had our tile sealed professionally throughout our house. We felt it would assist with keeping the dirt and grime from penetrating, thus making the grout lines unsightly. We are happy with our choice. We sealed it just after closing, before moving any furniture in. We were told that sealing the grout prior to the one year Warrenty being up would void the tile Warrenty. We figure we would take our chances since a years worth of dirt to clean may be more expensive than replacing a tile if anything should happen to it.
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