Olaplex works from within. It protects your hair from damage like bleaching, coloring, heat, and even from purple shampoos. It will also give you a lasting result of softer, smoother, and glossy hair even when you stopped using it for a month or two. And oh, since I started using Olaplex No. 3, I have never seen a single split-end on my hair.
FULL REVIEW: https://stylevanity.com/2019/07/olaplex-no-3-review.html