What keratin actually does
A keratin smoothing treatment doesn't break or rebuild the hair's internal bonds. It creates a protective protein layer over the cuticle, sealed in with a flat iron. Because the hair is protected for weeks at a time, its condition often improves. It also washes out gradually and evenly, so there's no line of demarcation as it fades.
Heat matters
The flat iron is part of every keratin treatment, so technique matters. A specialist adjusts the iron heat to the condition of your hair. For example, very light or platinum hair is typically treated at a lower 380–400°F.
Colored, highlighted and chemically treated hair
Keratin works well on colored, highlighted, bleached and previously relaxed or straightened hair, and it often makes damaged hair look healthier. It enhances color and shine rather than fading it.
Who should wait
Because there are no studies on its effects during pregnancy, we don't perform keratin treatments on pregnant clients unless their doctor clears them. Clients who are breastfeeding should also get their doctor's approval first.
Quick answers
Does keratin damage your hair?
Done properly, keratin coats and protects the cuticle rather than breaking the hair's bonds, and hair often looks healthier as a result.
Is keratin safe on bleached or colored hair?
Yes. It works well on colored, highlighted and lightened hair. Very light hair is treated with lower iron heat.