Yes it does a little but with right products u can minimise the damage. Many people start using regular shampoo after the treatment. My friend did this mistake too , her stylist friend recommended her to use Anveya Keratin shampoo and conditioner for her hair. The hair doesn't have any damage now and infact it is Nourished well

Keratin is a chemical treatment . And it does damage the hair in the long run .

As I know our hair naturally are made with keratin. By pollution and aging, this prote time layer gets damaged. But now the modern keratin treatment are their to regain it back .So I don't see any harm in it. But use A good keratine shampoo and conditioner after the treatment. I am using Anveya keratin shampoo and conditioner these days.

Keratin is a kind of protein that helps to restructuring of the hair strain. It's a chemical treatment and make the hair look better. You can opt it as it suits you budget. It's a temporary solution for looking beautiful