A chemical process, applied strand by strand, that changes how hair behaves between washes for a period of time — not permanently.
A smoothing or keratin treatment is applied to clean hair, processed under heat, and then rinsed and finished according to the specific system a stylist uses — the mechanics are broadly similar across methods, but how the hair responds is not. Curl pattern, hair density, and how much chemical processing the hair has already been through all affect how the treatment takes, which is why the same service can behave differently from one head to the next.
It is not a permanent change. The treated hair grows out and gets cut over time, and results fade gradually rather than on a fixed schedule, so how long it holds varies from person to person. Timing also matters if you color your hair — smoothing and color interact, and the order and spacing between the two services affects both, which is exactly the kind of thing worth raising at the consultation rather than discovering afterward.
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