How can I untangle my hair without breaking it. I have not combed it in 3 or 4 years I am african american. I?

Use a hot oil treatment on it, will make it silkier, then comb it with boar hair if possible, then start onto a plastic brush till its untangled, comb your hair regularly as you can get build up of shampoo and dust on your head which will come out as flakes or dandruff.