Bob Vila suggests using wax or acrylic floor polish to conceal light scratches in hardwood flooring. As an alternative, Vila suggests applying a product specifically designed to renew the wood such as Hardwood Floor Reviver from Minwax. Clean the floor thoroughly before applying. Sanding the floor is not necessary, although the product needs to be applied again every few months. Never use on wood laminate or factory-finished flooring.
Vila suggests using a stain to fix scratches that are so deep that they reach bare wood. Apply a traditional wood stain in a matching color with a small brush or a cotton swab. Wipe up any excess stain before it dries completely. Stain markers and blending pencils in an array of colors are also available at hardware stores or home improvement centers to fix this type of scratch.
Vila suggests using a pre-colored latex wood filler for a deep gouge. Apply the filler with a plastic putty knife, the tool least likely to cause further damage to the floor surface. Use fine-grit sandpaper to level the floor surface after the wood filler has completely dried. Apply varnish thinned with 10 percent or 20 percent turpentine over the now filled, deep gouge.