Which tool is appropriate for cleaning under the free edge of the nails?

The cotton tipped orange wood stick is the appropriate tool for cleaning under the free edge of the nails. This tool is specifically designed to be gentle and effective in removing debris from under the nails without causing damage to the delicate nail structure or the surrounding skin. The cotton tip adds an element of softness, reducing the risk of injury or irritation, making it especially useful for this particular task.

Using harsher tools like the metal pusher or nippers could potentially lead to injury or excessive pressure that might harm the nail or the skin around it. Clippers are primarily designed for trimming nails and are not suitable for cleaning under the free edge. The cotton tipped orange wood stick is versatile and ideal for this specific function.