If a client wants to maintain their curls while styling, they should use what?

Using a diffuser is the best choice for maintaining curls while styling. A diffuser is an attachment for a hairdryer that helps to disperse the airflow gently, allowing the curls to dry without being disturbed or flattened. This method helps to enhance the natural shape and bounce of the curls, providing definition and reducing frizz.

The heat from a diffuser can also help to lock in the curl pattern while minimizing the risk of heat damage, which is essential for maintaining healthy, well-defined curls. This technique is especially effective when used on damp or wet hair with a curling product, as it allows the curls to form naturally.

In contrast, tools like a flat iron would straighten the hair, a round brush could create volume or sleek styles rather than enhance curls, and a smoothing serum typically focuses on reducing frizz and adding shine, which may disrupt the curl’s natural pattern. Thus, using a diffuser is the most effective method for clients looking to maintain and enhance their curls while styling.