Any one or any combination of the following practices constitutes the practice of cosmetology when done for cosmetic or beautifying purposes and not for the treatment of disease or of muscular or nervous disorder: arranging, braiding, dressing, cutting, trimming, curling, waving, chemical restructuring, shaping, singeing, bleaching, coloring or similar work, upon the hair of the head or any cranial prosthesis; cutting or trimming facial hair of any person; any practice of manicuring, pedicuring, decorating nails, applying sculptured nails or otherwise artificial nails by hand or with mechanical or electrical apparatus or appliances, or in any way caring for the nails or the skin of the hands or feet including massaging the hands, arms, elbows, feet, lower legs, and knees of another person for other than the treatment of medical disorders; any practice of epilation or depilation of any person; any practice for the purpose of cleansing, massaging or toning the skin of the scalp; beautifying, massaging, cleansing, exfoliating, or stimulating the stratum corneum of the epidermis by the use of cosmetic preparations, body treatments, body wraps, the use of hydrotherapy, or any device, electrical, mechanical, or otherwise; applying make-up or eyelashes to any person or lightening or coloring hair on the body and removing superfluous hair from the body of any person by the use of depilatories, waxing, threading, or tweezers. The term “cosmetology” does not include the services provided by an electrologist. Nail technology is the practice and the study of cosmetology only to the extent of manicuring, pedicuring, decorating, and applying sculptured or otherwise artificial nails, or in any way caring for the nail or the skin of the hands or feet including massaging the hands, arms, elbows, feet, lower legs, and knees. Cosmetologists are prohibited from using any technique, product, or practice intended to affect the living layers of the skin. The term cosmetology includes rendering advice on what is cosmetically appealing, but no person licensed under this Act shall render advice on what is appropriate medical treatment for diseases of the skin. Purveyors of cosmetics may demonstrate such cosmetic products in conjunction with any sales promotion and shall not be required to hold a license under this Act. Nothing in this Act shall be construed to prohibit the shampooing of hair by persons employed for that purpose and who perform that task under the direct supervision of a licensed cosmetologist or licensed cosmetology teacher.