Which is the recommended pin curl base at the side front hairline for a smooth, unswept effect?

The recommended pin curl base at the side front hairline for achieving a smooth, unswept effect is the rectangular base pin curl. This type of base is specifically designed to create a uniform and controlled wave pattern, which is essential for maintaining a neat appearance at the front of the hairstyle.

Using rectangular base pin curls allows for more tension to be applied to the hair, resulting in a smooth finish. This is particularly important at the side front hairline, where a polished look is often desired. The shape of the rectangular base helps to direct the hair in a specific way, producing waves that appear more organized and refined.

Other types of pin curl bases may produce different styles or textures that could be more suited for volume or movement. For example, square base pin curls can create a more defined curl, triangular bases are often used to add lift or volume, and spiral pin curls work well for creating spirals or ringlets rather than a smooth appearance. Thus, the rectangular base is the ideal choice when looking to achieve a sleek and controlled effect at the hairline.