What precaution should be taken when using a razor on hair?

When using a razor on hair, ensuring that the blade is sharp and clean is essential for several reasons. A sharp blade allows for a cleaner cut, which minimizes damage to the hair. This can lead to a smoother finish and helps reduce the risk of split ends.

A clean blade is crucial from a hygiene perspective, as it prevents the transfer of bacteria and reduces the likelihood of infections or irritations that can occur when using a dull or dirty blade. Maintaining proper hygiene also protects the client and helps maintain the integrity of the hair during the cutting process.

While the other options may have their merits in specific contexts, the focus on a sharp and clean blade is fundamental in professional practices to ensure the safety and satisfaction of the client.