Which service is NOT provided by a nail technician?

A nail technician specializes in services related specifically to the care and enhancement of nails, as well as the cosmetic treatment of the hands and feet. This includes a variety of tasks such as manicures, pedicures, nail enhancements (like acrylics or gels), and nail art.

Cleansing and conditioning hair, however, falls outside the scope of a nail technician's training and responsibilities. This service is typically associated with the profession of a hair stylist or cosmetologist, who is trained to manage various hair-related treatments. Therefore, the correct choice identifies a service that is not provided by a nail technician, reinforcing the distinction between different roles in the beauty industry and their specific areas of expertise.