Which practice is illegal for a licensed beauty technician?

Using unapproved products is illegal for a licensed beauty technician because the safety and efficacy of beauty treatments are paramount in protecting clients' health. Licensed technicians are required to use products that have been tested and approved by regulatory bodies to ensure they do not pose any risk to clients, such as causing allergic reactions or other adverse effects. Using unapproved products bypasses these safety measures, potentially exposing clients to harmful chemicals or ineffective formulations that could lead to poor results or injury. Therefore, adherence to this regulation is crucial for maintaining professional standards within the beauty industry.