Our hair is especially stressed by dyeing, combing, brushing, hot blow drying or permanent waving. It is also subjected to the same variety of assault from the environment as our skin. Contrary to the skin however, the hair will not send a message of pain due to overexposure telling that a change is occurring. The message is more likely to come after cumulative damages over a summer season. The hair will show poor combability, more split ends, and will become noticeably weaker.