"Hair breakage" refers to the condition where strands of hair become weak and easily break or snap off, resulting in shorter or thinner hair. Full definition
Avoid using too many bobby pins and clips, which also cause hair breakage, and never sleep with your hair tied into a ponytail or braid. (womenshealthandfitness.com.au)
I just got this $ 10 Number Four detangling bush and it really helps to minimize hair breakage when I brush out my wet hair. (glassofglam.com)