Final answer:
The rules on whether licensees can drink & eat while doing hair vary by local regulations but generally are discouraged due to hygiene standards.
Step-by-step explanation:
The question of whether licensees are allowed to drink & eat while doing hair is primarily a matter of sanitation and professional standards, which may be regulated by state cosmetology boards or health departments. Generally speaking, it is advised that professionals in the cosmetology industry maintain a clean and hygienic workspace. This often includes not eating or drinking in areas where hair services are performed to prevent contamination and to maintain a professional atmosphere. However, specific regulations can vary by state and by establishment, so each professional needs to be familiar with their local rules.