What is the typical water content of a healthy nail?

A healthy nail generally contains a water content of approximately 15% to 25%. This range is crucial for maintaining the nail's flexibility, strength, and overall health. Having the right amount of moisture allows the nail to resist splitting and breaking, while also ensuring that it adheres well to the nail bed.

When the water content deviates from this range, it can lead to problems such as brittleness or increased susceptibility to damage and infection. Proper hydration is vital not only for the appearance of the nail but also for its integrity and resilience against environmental factors. Understanding this range is essential for nail technicians to provide appropriate care and maintenance for clients' nails.

The other options suggest water content levels that are either too low or too high, which do not reflect the physiological norms for healthy nails.