When Not To Perm
• When the scalp is damaged or the skin broken/damaged.
• When the hair is in poor condition.
• When the overall porosity of the hair is too high – over-bleached.
• In the presence of metallic salts, for example, Grecian 2000.
• When the hair has poor elasticity.
content provided by Heinemann
Always test the hair to check that it is safe to carry out perming.