I was a property manager for many years. This, to me, would not be considered general wear and tear. But, that depends on the condition of the property before the tenant started renting. Was there any previous condition with the floorboards? You have the right to take a portion of their security deposit when they move out because of this. All you need to do is to take pictures when they move out and mail them a letter with the rest of their deposit in a check stating why some of their deposit was used for home repairs.