To fill tile gaps in a bathroom, you can follow these general steps:

1. Clean the tile gap thoroughly using a brush or vacuum to remove any debris or dust.
2. Choose an appropriate filler material. This will depend on the size of the gap and the surrounding tiles. Common filler materials include grout, caulk or epoxy.
3. Mix the filler material according to the manufacturer's instructions. This may involve adding water or a catalyst to activate the material.
4. Apply the filler material to the gap using a putty knife or similar tool. Make sure the gap is completely filled and level with the surrounding tiles.
5. Smooth the surface of the filler material using a damp sponge or cloth. This will help to create a clean, even finish and remove any excess material.
6. Allow the filler material to dry or cure completely. This may take several hours or days depending on the material used.
7. Once the filler material is completely dry or cured, clean the tiles and surrounding area to remove any residue or excess material.

It is important to choose an appropriate filler material and follow the manufacturer's instructions carefully when filling tile gaps in a bathroom. If the tiles are severely damaged or the gap is too large, it may be best to hire a professional from Locals4u for assistance.