Regrouting and recaulking your bath or shower is an essential part of bathroom reconstruction that ensures a clean and water-tight seal. Start by removing the old grout and caulk with a utility knife or grout removal tool, being careful not to damage the surrounding tiles. Once the area is clean, apply new grout using a grout float, ensuring it fills all gaps thoroughly. After allowing the grout to set, it's time to recaulk. Choose a high-quality silicone caulk designed for bathrooms to prevent mold and mildew. Apply the caulk along the edges where the tiles meet the tub or shower, smoothing it out with your finger for a neat finish. Allow everything to cure fully before using the shower or bath to ensure the best results in your bathroom reconstruction project.