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While the majority of chemicals in beauty products present very little or no threat, some have been linked with significant medical issues, including neurological harm and cancer. Chemicals in cosmetics get into the body through inhalation, the skin, and ingestion, and cause the same problems as food chemicals, per this site.

Chemicals linked to cancer can be found in water, food, and various other common products. But, no type of consumer products is subject to less government oversight than cosmetics, including Sally Hansen Color Quick Pen. Although most of the chemicals and contaminants in cosmetics almost certainly pose very little risk, subjection to some has been linked to serious health issues, including cancer.