Tennessee Cosmetology Practice Exam 2025 - Free Cosmetology Practice Questions and Study Guide

A retouch on hair color typically should be performed every 6 to 8 weeks. This timeframe allows for the natural hair growth to become noticeable, particularly at the roots, where the difference in color between the regrowth and the previously colored hair can be striking. Maintaining this schedule helps to ensure a seamless blend of color, keeps the overall appearance fresh, and prevents any harsh lines from forming.

Regular retouching within this timeframe also supports the health of the hair, as it avoids prolonged exposure to color, which can lead to damage.

In contrast, options such as the shorter interval of every 2 to 4 weeks may not give enough time for the hair to grow out adequately to warrant a touch-up, while longer intervals such as 10 to 12 weeks or once a year could result in significant root growth that disrupts the overall look, making it difficult to achieve a uniform color without further corrective processes.