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You shouldn’t add new grout over grout that’s broken, cracked, or crumbling. If you do, the new layer might not adhere properly to the old one, and you could end up with even more grout issues. Plus, if you don’t remove the damaged grout, you’ll be ignoring whatever underlying problem initially caused the grout to crack, which could lead to more serious issues down the line.

Signs of mold under silicone caulk include discoloration or dark spots appearing through or around the caulk, a musty odor in the area, and visible growth on the surface of the caulk. Additionally, if the caulk feels soft or spongy, it could indicate moisture trapped underneath, which is a breeding ground for mold.

Regular sealing, pH-neutral cleaners, and avoiding acidic substances help maintain their appearance and longevity.

You should plan to reseal the grout in your shower every one or two years, depending on how often your household uses the shower. Resealing shower grout costs around $200, but it will help extend the lifetime of your shower and freshen it up without having to go through the entire process of regrouting your tile shower. If you have a custom shower enclosure with grout between tiles on the floor, that grout should be resealed more often due to increased wear—once every six months might be necessary.