In our quest for beautiful hair, we often do things that damage our hair. Damaged hair is fragile, so it tends to break. Hair breakage can leave us with frizzy, unhealthy looking hair. If we continue to damage our hair, we may eventually see thinning hair or even bald spots. The good news is that simple changes can prevent further hair damage. On this page, you ll find 10 common hair-care practices that can damage hair and dermatologists tips that can help you to stop damaging your hair.