The hair stresses were treated through permanent agent(ammonium thioglycolate)for 1,2 or 3 times,and hair damage was evaluated with two indexes such as SEM for surface morphological change and mechanical properties for hair structural damage.

The damage of perm and dyeing to hair and the reparative effect of shampoo and hair conditioner on hair;

A sensitive method to qualitatively and quantitatively evaluate chemical perm da mage to human hair has been developed.

Embryonic toxicity of hair curling solution and mousse on pregnant and fetal mice;