Hardwood floors may need repairs for a variety of reasons - broken boards, pet damage, water damage, walls removed, vents relocated, holes in boards, buckled flooring, etc. With the proper flooring and expertise, repairs can be blended into the floor seamlessly. Over the years, many hardwood floors develop small splits or cracks in the surface of the wood. These can be spot repaired with some angled nails to secure the two pieces together, along with some wood putty to hide the blemishes. If your floor is suffering from large cracks, however, you might want to think about refinishing the floor. And if the split is particularly bad, you should probably replace the damaged plank altogether.