Missouri Board of Cosmetology Practice Exam

What is one of the effects of hard water on hair?

1. It can make hair feel dry and brittle

2. It makes hair shinier

3. It improves hair's natural curl

4. It has no effect on hair

The correct answer is: It can make hair feel dry and brittle

Hard water is water that contains high levels of dissolved minerals, primarily calcium and magnesium. When hair is washed in hard water, these minerals can accumulate on the hair strands. This accumulation leads to several issues, one of which is making the hair feel dry and brittle. The minerals in hard water can prevent moisture from penetrating the hair shaft, resulting in a lack of hydration. Consequently, the hair can lose its elasticity and softness, leading to the perception of dryness and brittleness. In contrast, the other options do not accurately describe the effects of hard water on hair. Hard water does not enhance shine, as the mineral buildup can make hair look dull and lifeless. It also does not improve the natural curl of hair; rather, it can weigh hair down and disrupt its natural texture. Lastly, hard water definitely has an effect on hair, contrary to the claim that it has no impact at all. Understanding the implications of hard water is essential for maintaining healthy hair, particularly in regions where hard water is prevalent.