Here is how to revive them
There is a method that allows you to revive the tiles quickly and effectively, saving time and effort.
The method in question consists of using a special glue based on cement mixed with an elastic substance, such as rubber. It is available in the main specialty stores.
In the meantime, you need to remove the old joints with a hacksaw or other power tool and then proceed to apply the product. This method is much faster and easier than traditional tile laying techniques, as it does not require the use of grout and does not produce dust. In addition, the elastic solution used allows to compensate for any irregularities in the surface, guaranteeing a perfect result.
After applying it, it is advisable to let it dry before walking on it. We are sure that the result will be the best and will make you forget that you have a floor that is several years old.