The Grout Doctor ® has the cure for this ugly cracked and stained floor grout. Not only is cracked grout in a floor unsightly, if not treated, it can cause damage to the floor's underlayment and possibly create the need for costly replacement of the floor. The Grout Doctor© can remove the damaged grout and broken tile if you have a replacement tile. Your Grout Doctor will try to match the color as closely as possible.