Changing your look with hair dye can be exciting. That new shine, a color that reflects your personality, or simply covering those gray hairs that are appearing always creates a feeling of renewal. However, behind this aesthetic change lies an issue that is often overlooked: the care and precautions that must be taken to ensure the experience doesn’t turn into a headache… or worse, a health problem.

Hair dyes aren’t harmless. Although they’re designed to beautify, they contain chemicals that, if misused or used without proper precautions, can cause adverse reactions to the skin, scalp, and even overall health. Therefore, beyond just thinking about which shade will suit you best, it’s a good idea to take a moment and know what to do before, during, and after applying them.

Perhaps the most repeated recommendation, and paradoxically, the most ignored. Before applying a hair dye, it’s always necessary to do a skin test by placing a small amount behind the ear or on the inside of the arm. If redness, itching, or swelling appears within 24 to 48 hours, it’s best not to use the product. Skipping this step can result in a serious allergic reaction.

. Not all dyes are created equal. Some contain more ammonia, peroxides, or other harsh chemicals that can damage your hair and skin. Always look for reputable brands, preferably those that offer gentler formulas, fewer harsh chemicals, or added natural ingredients to protect your hair.