Remove Old Grout
To replace one tile, first dig out the grout around it. Do this with a tool called a grout rake – a utility knife works well too. For a group of tiles, dig out around the section of tiles you’re replacing.
Break Up Damaged Tile
Shatter the broken tile into small pieces by hitting it with a hammer and a chisel. Be sure to wear safety glasses because pieces may go flying.
Pry out the pieces and scrape off the grout and adhesive with a chisel or putty knife. Do not disturb the substrate. Remove all the debris and get the surface as clean as possible.
Replace With New Tile
Once the tile is all cleaned out, dry-fit the tile first to ensure it is flush with adjacent tiles, then set new tile with recommended mortar.