[Kory]

Eee!

That's a good indicator of needing a wash, though!
Since my hair is curly, it does the opposite when it needs to be washed; it gets really dry and sometimes even flaky when it's time for a wash. And it will smell sometimes too, but only if you stick your face in it.

I try to wash my hair about twice a week, or like you said, once every 3-4 days.
My products are expensive though, I always have to use special shampoos and conditions because I have an afro. Also I've got like three different textures all on the same head >3< Different textures require different care/products.

I also always always use products not tested on animals, so it's even harder and more expensive to find the right products >:T