I use it every time I want to use heat on my hair, I haven't noticed any difference...
I haven't noticed if it protects the hair...
However, they become more rigid... like straws... after applying the heat protectant and the straightener...

The best heat protectant of all time and at a very good price. With discounts, you can find it for a price of 7.50-8 euros. It is only applied to dry hair, at not too close distance, and it has the form of a spray like hairspray without making the hair sticky or stiff naturally. It doesn't leave the hair wet nor is it creamy like others, and it really does the job. I have tried many heat protectants, both well-known and expensive ones, and since 2018 when I discovered this one, I wouldn't change it for anything. I have used dozens of bottles. My hair is in excellent condition, I straighten it with a flat iron about 3-4 times a month, always using this product