Which of the following is NOT a permissible practice for a licensed cosmetologist in Colorado?

A licensed cosmetologist in Colorado is permitted to perform a variety of beauty services, including facials, manicures, and hair coloring, as these fall within the scope of practices defined by state regulations for cosmetology. Each of these services involves non-invasive techniques and is designed to enhance a client's appearance.

Performing surgery, however, is not a permissible practice for licensed cosmetologists. Surgery is a medical procedure that requires specific training, skills, and a medical license. It is associated with invasive techniques that go beyond the aesthetic services provided by cosmetologists, which focus solely on cosmetic enhancements and personal grooming without delving into medical interventions. Therefore, choosing surgery as a practice aligns with the understanding that it is outside the realm of cosmetology and requires medical qualifications and licensure to perform safely.