Me and my friend are planning on pre-lightening our hair using Garnier Belle Blonde Pre-lightener.
We will probably have to do this twice as our hair is dark brown and black. How long should we wait in-between?
Around 2 months after we have done this we are dying our hair turquoise/green and lilic/blue.
Will this be okay?
Also, in the mean time, how can I get my hair healthy as it has suffered a few years of dyes and damage?