I was wondering if pure organic peppermint oil goes moldy or something? ill dilute it with water and still the next day i wake up smelling something weird om top of the peppermint. It really helps wi
if it is good quality oil(not $2 bottle) it should be fine for ever, the cheaper you pay the less pure it is.
if Baba is right and your getting you hair constantly wet it may be getting a little mouldy(stale wet smell) so try keeping them drier and also put some lavender oil in with the peppermint(in the water not the oil)it's good for mould. i use it all the time for the itches smells and works great.