I never personally tried it because I'm white but I have 2 sisters who aren't that used this product a lot when they were young, this was always my mom's go to product when they were kids and seems to think it got the got well done.
At the age of 12 this was the first relaxer and at the time my hair was near my neck. A family member convinced my mom let them relax my hair. This was my go to perm till I was about 15 then I stop using it . Nothing bad about it