Keratin treatments shouldn't be done more than three times a year, as over time they can start to damage hair. Summer, when frizz is more pronounced because of humidity, is generally when people want to get them done.

Can keratin damage your hair?

Keratin is a family of proteins that make up hair, nails, feathers, horns, and the outer layer of skin. ... However, the protective keratin in your hair can become damaged or depleted if you're prone to overstyling your hair, or constantly applying heat or chemicals to it.

How long does keratin stay in?

Results can last up to anywhere from weeks up to six months. There are many different versions of the treatment that go by different names (Brazilian Blowout, Cezanne, Goldwell Kerasilk) and your hairstylist can customize a blend of the formula to suit your needs.