To fix the crack you have a couple of options.
How to rrepair broken tile shower wall.
Use a sharp razor knife to scrape off any old dried caulk and soap residue from the top edge of the bath or shower base.
Sometimes the broken tiles are securly attached to the shower walls and the shower tile will not come out without also removing a piece of the underlying shower wall.
Ceramic shower tiles may be damaged or broken over a period of years.
How to replace a broken tile.
This may include damage to the grout joints or even individual tiles may crack causing water to leak into the walls or floor space where it can damage subfloors or lower level spaces.
In modern construction shower tile is generally installed with a moisture barrier under a base of waterproof cement board so water damage is somewhat less likely.
You can replace the entire tile.
You can repair the crack with tile filler and then paint over the filler with a color that matches the rest of the tile.
Then remove the rest of the tile with a hammer and chisel.
In older homes ceramic shower tile was often installed directly over drywall.
Cosmetically repair hairline crack in shower tile.
Cracked bathroom tiles can be caused by either an instability in the surface under the tile or in rare cases the low quality of the tile itself.
The final step to repair shower tile after a leak is to fill the gap along the top of the tub or shower with silicone caulk and protect all grout joints with a liquid silicone sealer.
Showers are built today with waterproof membranes behind the tiles and the grout between tiles isn t necessarily 100 waterproof anyway.
These walls are susceptible to water damage if the tile s grout joints develop gaps.
If a tile is set correctly it will pull off the waterproofing on the backer board.
One thing to be aware of is that a hairline crack in shower tile is mainly a cosmetic issue.
In these cases you may be forced to cut into the adjacent wall and repair the hole in the adjacent wall.
Which made removing and resetting the tile easy.
However that doesn t make a hairline crack any.