We just had our house remodeled. It came out beautiful, but I’m not happy with the grout in many places around the house. There are areas with grout that seems to be missing. Every few days I find other areas as well. How do I fix this? Can I just add grout in? Will it stick and mix in with the rest of the grout? Does the grout disappear or wear off because I find different areas every few days that I hadn’t seen before. We moved back in 4 months ago, and this is very frustrating… will this cause the tile to crack or chip and will water go in and cause mold?