What you can do: Avoid using appliances that overheat your hair. Set your hair dryer on cool and low settings, and minimize your use of flat irons. Don't dye your hair more than one or two shades its normal color: The more severe the color change, the more chemicals you require, which can make hair break. If you use hair gel or hair spray, don't wait for it to dry before you comb through it, because the hair will harden and be more likely to break.
The condition of your hair doesn't just affect your looks—it's an important indicator of your health. If you're experiencing hair loss, talk to your dermatologist.
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