Damage to Kitchen Worktop

Hi
My tenant has damaged a fairly new kitchen worktop. It looks like somebody has been cutting on the surface with a knife so there’s all tiny cut marks and a small chip.
He didn’t tell me about it but came up on a mid term inspection.
I approached him and he admits the damage but doesn’t want the hassle of replacing the worktop as it involves removing the sink, hob and upstairs. He’s asked if it can be deducted from the deposit if he ever moves out.
I’ve explained that would be to fine but what if there’s any other damage to be take out of the deposit.
What do landlords normally do in this situation?