Which of the following is a common reason for hair color fading?

Excessive heat styling is a well-known factor that can lead to hair color fading. The high temperatures of styling tools like flat irons, curling wands, and blow dryers can strip moisture and cause damage to the hair cuticle. When the cuticle is compromised, it allows color molecules to escape, leading to a duller appearance and fading of the color. This effect is particularly pronounced with permanent hair dyes, as they rely on the integrity of the hair shaft to maintain vibrancy.

In contrast, using leave-in conditioner generally helps to moisturize and protect the hair, potentially prolonging the life of the color. Frequent haircuts can aid in removing split ends and damaged hair, but they do not have a significant direct impact on color retention. Regular scalp exfoliation can promote healthy scalp conditions, but it does not contribute to color fading. Therefore, while styling practices are critical to maintaining hair health and color, excessive heat styling remains a primary reason for color fading.