Final answer:
The necessary step after completing the hair design procedure is to add finishing touches.
Step-by-step explanation:
The necessary step after completing the hair design procedure is to add finishing touches. This involves making any final adjustments or enhancements to the style to achieve the desired look. It may include smoothing or adding texture, adjusting the placement of accessories, and overall fine-tuning of the hair design.
Checking for overall balance is a crucial step during the hair design procedure itself, not after its completion. Disinfecting multi-use supplies is important for maintaining hygiene and preventing the spread of infections, but it is typically done before and after each use, not specifically after completing the hair design procedure.
Insisting the client purchase an item is not a necessary step after completing the hair design procedure. While it is common for stylists to recommend products or tools that can help maintain the hairstyle, it is ultimately the client's choice whether or not to make a purchase.