Hi everyone. I recently changed my shampoo from a drug store to Kerastase Homme (i have hair thinning). I have thin hair, lacking density. I wash them 3 times a week as they get easily flat (especially on summer days). But recently the day after I wash them my hair get already flat so I have to use cornstarch to pump my roots and get the volume I want. Can this be bad for my hair; ps I have bleached white hair and oily scalp. Thanks.