Hi Arusha!
I don’t think that a serum is going to be enough as it only coats the surface of the hair. Using a good conditioner normally gets knots out and it is always best to combe the hair through with the conditoner still in your hair. The best detangling conditioner that I have used is from MATRIX and its called Moisture Cure (R155). This takes out all knots and conditions the hair without weighing it down.
happy combing!
Candice
MIRRORS hair lab
0214243931