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“We generally consider children as more sensitive to toxicant exposure—lower body volume means higher doses,” he says. “Growth and development of some body systems, especially those responsible for endocrine, metabolic, neurocognitive, and reproductive functions, can be sensitive to DNA-altering chemicals, and host-defense systems may not be fully mature to detoxify foreign substances.” Basically, while your body may be able to easily clear the chemicals in hair dye, it can be tougher for a little kid’s body to do the same thing.Joshua Zeichner, M.D., a New York City-based board-certified dermatologist and director of cosmetic and clinical research in the Department of Dermatology at The Mount Sinai Hospital, tells SELF that he’s also not crazy about the idea of dyeing a child’s hair. “In kids, hair is generally much thinner and strands of hair themselves are finer, so dyes may have a more potent effect,” he says. There's also a chance that a child will have an allergic reaction because children's scalps are so much more sensitive, Dr. Zeichner says.
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