At which of the following times is handwashing indicated?

Handwashing is critically important in maintaining hygiene and preventing the spread of infections, particularly in a professional setting such as during electrolysis or laser treatments. The practice of washing hands before and after treatment is essential to ensure that both the practitioner and the client are protected from pathogens that could be transmitted during the procedure. By washing hands before the treatment, the practitioner minimizes the introduction of germs to the treatment area. Washing hands after the treatment helps to remove any potential contaminants that may have been picked up during the procedure.

While the other situations listed—such as before eating, after using the restroom, and before entering the house—are also important for general hygiene, they are not specifically relevant to the context of an electrolysis or laser treatment practice. Therefore, the focus on handwashing before and after treatment is crucial in this specific scenario to uphold safety and cleanliness standards in the practice.