olaplex does it really stop breakage?

There are several threads on Olaplex if you search the site.
TBH I don't see much difference, but then i don't ever see breakage from bleaching. If you bleach over coconut oil and use a good quality bleach with a low vol peroxide you should see minimal damage on virgin hair.

It's not made a difference on my already damaged hair as many have said it does.

My new growth that I've been bleaching seems to have a definite line where it's a bit stronger since I've been using olaplex. If I think it's enough to be worth it, not sure yet. I'll have to tell you in another year or so when it's all grown out. Still, it'll be hard to say if it's the olaplex or if I'm just treating it better again.