Keratin treatments have become a go-to solution for people seeking smoother, frizz-free, and more manageable hair. By infusing the hair with a keratin solution that’s sealed in with heat, these treatments can dramatically reduce frizz and enhance shine. But one of the most common questions people ask is: How long does a keratin treatment actually last? The answer isn’t one-size-fits-all — it varies depending on hair type, texture, porosity, aftercare, and the specific treatment used. Here’s a breakdown of how long keratin treatments typically last on different hair types and why the duration can vary.