Silk press, honestly
A silk press is straightening without chemistry. That makes it reversible, which is the appeal, and it is also why the heat question decides whether it stays reversible.
What it is
A wash, a blow dry and a flat iron, with no chemical relaxer involved. The result is straight, smooth and mobile, and it holds until water or humidity reaches the hair. Nothing about the structure of the strand has been permanently altered, which is the whole point of choosing it.
It is not a relaxer, and the difference is permanent
A relaxer breaks the disulphide bonds that give a curl its shape. That change does not come back, which is why relaxed hair grows out with a line rather than reverting. A silk press only changes the hydrogen bonds, and those reset with moisture. One is a chemical process, the other is a temporary one, and no stylist should be describing them as alternatives to each other without saying so.
The heat question
Most of the risk in a silk press sits in two numbers: how hot the iron is and how many times it passes over the same section. Professional practice generally stays at or below about 200 degrees Celsius, near 400 Fahrenheit, and aims for one pass, occasionally two. Higher than that, or six passes chasing a result that a proper blow dry should have delivered, is where damage starts.
A heat protectant is not optional, and it is not a substitute for a sensible temperature. It buys margin, not immunity.
Why it reverts
Humidity, sweat and rain all put water back into the hair, and the hydrogen bonds go back to the shape they prefer. This is not a fault in the work. A press that survives a Lagos afternoon or a gym session was almost certainly done at a temperature that will cost you curl later.
Wrapping at night, a silk or satin scarf, and keeping the hair dry are what extend it. Expect one to two weeks in ordinary conditions, and less in humidity.
How often
Common professional guidance is to leave at least six to eight weeks between presses, and many stylists working with type 4 hair space them further than that. The reasoning is cumulative rather than per session: each pass costs a little elasticity, and the loss is not visible until the pattern stops returning.
Worth asking before you book
- What temperature do you press at, and how many passes.
- What heat protectant do you use, and is it in the price.
- Can I see a press you have done on hair like mine, photographed the same day.
- What do you do differently if my hair has been coloured.
Coloured hair is the one to press on. Lifting already costs the strand something, and a press on top of it needs a lower temperature and a stylist who says so unprompted.