South Dakota Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

Paddle brushes are ideal for smoothing and straightening hair due to their wide, flat surface, which allows for maximum contact with the hair. This design helps evenly distribute heat from styling tools like blow dryers, making it easier to straighten and smooth out the hair during the styling process. Additionally, the long bristles can efficiently detangle hair while providing a smooth finish, which is essential for straightening.

In contrast, round brushes are typically used to create volume and curls rather than smoothness. Vent brushes feature openings that allow air to flow through, which speeds up drying but may not effectively straighten or smooth hair. Teasing brushes are designed for backcombing and adding volume, which is contrary to the goal of achieving sleek, straight hair. Therefore, the paddle brush is the most suitable choice for the task of smoothing and straightening hair.