In the State of Tennessee, a shampooing license is not required as shampooing has been deregulated, allowing anyone to offer this service. Without a Cosmetologist or Master Barber license individuals cannot provide services such as blow drying, curling, or using styling tools, only shampooing.
A licensed Aesthetician can massage the hands, scalp, and feet.
Additional information on each license type offered by the Tennessee State Board of Cosmetology and Barber Examiners can be found here: https://www.tn.gov/commerce/regboards/cosmo/license/individual.html.
You may also view the rules and laws here: https://publications.tnsosfiles.com/rules/0440/0440.htm.