We dye, paint, perfume, and spray with reckless abandon, but could our favorite beauty products be doing us more harm than good? Dermatologist Jason R. Lupton weighs in with his list of the top six most dangerous ingredients. After reading this, you might want to start checking the labels of your favorite brands.

1. Mineral-based makeup.

Tiny nanoparticles of materials are usually found in mineral-based makeup, which may be anything from foundation to blush to eye shadow. When the minerals are pulverized into nanoparticle size, they may have toxic properties which are especially concerning if inhaled or applied to damaged skin. Titanium dioxide appears to be among the most worrisome, as it could lead to the formation cell-damaging free radicals. If inhaled, these nanoparticles may infiltrate the lungs and intestinal walls as well.

2. Nail polish and hairspray.

Compounds known as phthalates are found in nail polish, hairspray, and even some perfumes and detergents. These chemicals have been linked to birth defects in mice and are completely banned in parts of Europe. They may also lead to infertility.

3. Dark Hair Dye.

The darker hair dyes have been linked to certain types of lymphomas (cancers), including non-Hodgkin's, Hodgkin's, and multiple myeloma. A study by Yale University researchers found that women who used brown, black, or red dyes at least eight times a year for 25 years had their cancer risks doubled. The risk didn't increase in those who had used lighter colors.