The other night I was cleaning the shower and using the grout brush to scrub the shower floor what I thought was a tiny bit of mold.
I scrubbed it for a few seconds then I realised it was actually a gap where the grout has started to crumble. Should I be worried that water could penetrate through this gap and may cause some sort of internal damage or am I just being a worry wort?
The picture of the shower floor gap is here
https://files.ozbargain.com.au/upload/205563/54891/9ca4542f-…
yea you will want to patch that up sooner rather than later as yes there will most likely be water getting through it underneath. You can buy tubes of grout at hardware stores, or even just use coloured silicone