A wooden soap dish will last for many years, it just needs a little more maintenance than one made of plastic or ceramic.
Naturally, the wood will absorb water and could start to curve. If this happens, all you have to do is to let the soap dish completely dry for a couple of days. The soap dish will flatten out again to it’s original shape.
It’s recommend to clean the soap dish every so often to prevent soap scum build up. This is the perfect time to let the dish dry after cleaning it.
If you buy a pair of soap dishes, then you can use the other one while it dries.
*Soap dishes have been coated with mineral oil used for cutting boards which brings out the wood grain.