What type of perm rod would you use on fine hair?

• A. Concave
• B. Convex
• C. Circular
• D. Straight

Answer: (A)

Fine hair benefits from a curl that shows more definition without losing lift. The rod’s shape controls how tightly the hair wraps around it. A concave perm rod tapers, being narrower in the center and wider at the ends. When fine hair is wrapped on this kind of rod, the smaller central diameter creates more tension and a tighter curl pattern, giving better definition and the appearance of more body. A convex rod would create a looser curl, which can look limp on fine hair; circular or straight rods produce less variation in curl and typically less defined results. So the concave rod is the best choice for fine hair to achieve a tighter, more noticeable curl.