Definition of «to damage the hair»

"To damage the hair" means to cause harm or negative effects to the strands of hair, such as making them weak, broken, or unhealthy.

This essential amino acid helps to stimulate collagen and is important for repairing damaged hair. (aminoacidstudies.org)
Don't damage your hair by applying too much heat or too many chemicals. (foodpyramid.com)
I'll be sharing how I prepare my hair for hot tools without damaging your hair next week. (styleoptimist.com)
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