I'm really not a big fan of this dry shampoo. It merely absorbs the oil, from the dirt. I don't know if it's all in the mind but it actually makes me hair feel dirtier. I have this in my ICE (in case of emergency) stash. I don't use it unless I really, really have to. So this can has lasted me more than 6 months. They say don't spray too much because a white residue will form, in my opinion, this white residue forms rather easily.