Currently, damaged hair cannot be repaired permanently.
Weak and damaged hair conditioners simply fill in he holes where your cuticle has been damaged and after a few washes those holes get uncovered again. This is why those conditioners need to be re-applied every few weeks.
Scientists are currently working on developing ingredients that can repair hair permanently but for the moment that research is in it infancy and the best you can do, is avoid getting hair damage in the first place. Here are a few tips:
How about henna?
Well, henna only coats hair, it doesn't change the bonds in hair but by coating hair and making it fuller there may be more friction between hair leading to more tangles. Personally, if I were to dye my hair I would go for henna or a dye that coat hair (i.e. increases the likelihood of tangles) than dyes that lift the hair cuticle (i.e. and hence increase the likelihood of damage).
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By Heather Katsonga-Woodward