Start by cleaning the entire area around the scratch. You will want to remove all traces of dust and grime on the floor before you begin any other steps. Pay close attention to the inside of the crack itself, which should be totally free of dirt, if possible. If you have a wax layer, use a wax remover solution to clear away the wax before you begin the repair.

Eliminate any problem spots to make the subfloor level. Sand minor humps down with a hand-held or orbital sander to make the subfloor level. To fill any dips or low spots, use a leveling compound (also known as floor patch). Mix up the compound according to package directions, fill in the dips, then pull your straight piece of lumber back and forth over the spot to flatten and level it with the rest of the subfloor.[7] Denver Hardwood Floors
Warranty & Brand – The value of your floor extends well beyond the floor itself. The people that created, tested, produced, and support it are just as important to consider. You want to make sure you are buying a floor from a manufacturer who you can trust. What kind of testing are they doing to make sure the floor you are buying will last? How can they help you if problems do occur down the road? What does the warranty actually cover? These are important factors to consider, especially when hardwood flooring doesn’t meet Rigid Core flooring’s abilities in areas like durability, dent resistance, and waterproofing. Denver Hardwood Flooring
Make cuts perpendicular to the direction the wood is laying. Using a circular saw, make single cuts straight across the flooring that are about 1 foot (30 cm) to 2 feet (61 cm) apart. Be sure your cuts are perpendicular to the direction of the wood. Start on 1 side of the room and work your way systematically to the other side, spacing each cut about 1 foot (30 cm) to 2 feet (61 cm) apart.[3] Denver Hardwood Floors
If you have a small, single scratch that’s only noticeable when you get close (like a scratch caused by an excited pet) and your floor has a relatively new finish, try a DIY home solution first. Mix equal parts apple cider vinegar and olive oil in a small cup, and dab the mixture into the scratch. Leave it for the rest of the day, and rub it out. This method often takes care of minor scratches.
Engineered wood flooring was created to lower the cost of wood flooring and attempt to fix some of solid wood’s shortcomings. It’s constructed from inexpensive plywood or particle board and topped with a thin veneer of hardwood. This construction helps with installation flexibility and slightly improves indent performance, but it adds a new set of problems as well. Because the “real” wood part of the floor is just a thin veneer, damage from scratches can be irreparable. Engineered wood floors are still made from porous wood, meaning they can’t be subjected to water. Denver Hardwood Floors
If your floors are in need of a deeper cleaning, use a wood floor cleaner. Follow the instructions for diluting the cleaner in water. Clean the floors with a damp mop, going with the grain. Then, go back over the floor with a clean, damp mop to remove any excess cleaner. Finish by drying the floor completely with a dry towel. Remember, leftover standing water could damage your wood floors.  Hardwood Floors

To fix a buckled floorboard, you need to be able to access the floor from below. The way to tackle this problem is to put weight on the buckled area from above — a cement block works well. Then install a 1 1/4-inch screw in the buckled flooring from below. Allow the screw to penetrate only halfway into the flooring, or it may come up through the finished surface. Driving the screw through the subfloor and into the flooring pulls the flooring down against the subfloor and gets rid of the buckled spot. Hardwood Floors