High heels, pet nails, dropped heavy objects, furniture legs, etc. will dent wood flooring. The best solution is prevention: remove high heels, trim pet nails, and use felt protectors on furniture legs. A satin finish instead of a glossy finish will reduce the appearance of dents and scratches. (unfortunately satin is also less durable) Otherwise you will have to refinish the floors to get out the dents.

There is no other effective repair.