What is the best hardwood gap filler to use for repairing gaps in wood flooring?

The best hardwood gap filler for repairing gaps in wood flooring is a wood filler specifically designed for hardwood floors. These fillers are typically made of a combination of wood fibers and adhesives that closely match the color and texture of the wood, providing a seamless finish. It is important to choose a filler that is compatible with the type of wood flooring you have and follow the manufacturer's instructions for application.