It's a good idea to update your shower or tub when you notice signs of wear and tear such as cracks in the bottom of the tub, yellowing tile, chipping grout, stains, dents, and leaks. Ignoring these issues can put you at risk for mold, mildew, and serious leaks. Other reasons to consider a new shower or tub include water behind the wall, mobility issues, remodeling, size issues, and selling your home.