Even though the tile in your bathroom might look good for the most part, it may be showing some signs of age. As long as you don't have any cracked or damaged tiles, you should not have to replace the tile for quite some time—after all, it is durable. However, the tile might need to be regrouted at some point. These are some signs that it might be time to have this done.
If there's a sidewalk or walkway on your property that has an uneven crack, it could be a serious tripping hazard. You wouldn't want someone to fall on the concrete and break a bone. Cracks that are level can be filled with patch material, but when one side of a crack is higher than the other, a different method is required. A concrete contractor can usually fix the problem without having to tear up the walkway.