Final answer:
Professional nail technicians need to complete training and certification to obtain a license. The requirements may vary by state but often include completing a cosmetology or nail technician program, passing exams, and fulfilling continuing education requirements.
Step-by-step explanation:
Professional nail technicians require specific training and certification to ensure their competence and safety. They typically need to complete a state-approved cosmetology program or nail technician program and obtain a license from the state regulatory board. The specific requirements may vary by state, but they often include completing a certain number of training hours, passing written and practical exams, and maintaining continuing education credits.