California Cosmetology Practice Exam

The texture of hair is determined by the diameter, or width, of the hair strand itself. This is determined by genetics and cannot be changed by external factors such as products or hair color. Although maintaining a healthy scalp is important for overall hair health, it does not directly affect the texture of the hair. Similarly, while products can alter the appearance and feel of the hair, they do not change its texture. Natural hair color may vary between individuals, but it is not a determining factor in hair texture. Therefore, the diameter of the hair strand is the only correct answer for what determines hair texture.