Well, first three days after the keratin treatment are always critical and you need to be extra careful with your hair.
For instance, you should not wash or even slightly wet your hair, you should not tie any band or clips on your hair,
you should not put hair behind your ears, you should not brush and you just need to keep them down straight to avoid any kind of dent in your hair.
And even after three days, you should not wash your hair very frequently or rub them using towels.