My hair gets build up like cradlecap evry 3days I can't get rid of. Thats when I noticed the breakage?

I almost need to wash my hair every 3 days. I thought it was an oil moisturizer and its not. I can wash and put nothing on my scalp and it will lastt a little longer, but not much. My hair is very thick. I have been told it could be rapid cell turnover, but with the breakage I can't see that.