Have you ever doubt if Mohanlal or any other actor is wearing a wig?
That's true but the fact is that it is not just normal wig, it is called hair fixing.
'The Prince' is the last movie in which Mohanlal appeared without any wig. He has been using this hair fixing from the film 'Rakhta Saksikal Sindabad'.
Not only Mohanlal, most of the prominent actors in Malayalam (including Mammootty, Jayaram, Jayasurya, Kunchacko Boban, Prithviraj etc) and other film industries are following this technique. This sort of hair fixing is normal nowadays when actors having enough hair also uses it for stylish purposes.
Hair Fixing is done by first of all shaving of the whole existing hair. Then a patch of hair particularly designed for certain shaped head are pasted on the head. This will stay on the head for a minimum of two-three weeks until the sticking property diminishes. This patch of hair will be exactly a look alike of the original hair.