What is a common effect of using hot water for washing hair?

Using hot water for washing hair generally results in dehydration and dullness of hair. Hot water can strip the natural oils from the scalp and hair strands, leading to dryness. This loss of moisture can cause the hair to become brittle, frizzy, and lifeless, presenting a dull appearance. Additionally, the scalp may become irritated, which could contribute to further issues such as dandruff or an unhealthy scalp environment.

In contrast, cooler water is usually recommended for rinsing hair because it can help to seal the hair cuticle, retain moisture, and give hair a shinier appearance. Therefore, the knowledge that hot water can lead to dehydration and dullness is key when considering hair washing practices and maintaining healthy hair.