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Although many chemicals in cosmetics pose minimal or no danger, some have been linked to significant health issues, such as cancer, and neurological harm. Chemicals in cosmetics get into the body through the skin, inhalation, ingestion and internal use, and cause the same problems as food chemicals, per this site.

Chemicals and contaminants associated with cancer are found in water, food, and various other ordinary products. However, no classification of consumer products is accountable to less government oversight than cosmetics and other personal care products, including Sally Hansen Continuous Treatment Hardener. While many of the chemicals and contaminants in cosmetics almost certainly pose very little risk, exposure to some has been associated with serious health concerns, including cancer.