That is really odd thing for your mom to say. I have to admit, I usually don't tell people to disobey their parents. However I am going to have to tell আপনি to not listen to her. Hair should be washed every other day, to keep it clean. Yet আপনি shouldn't wash it everyday. If আপনি don't keep আপনি hair clean, your hair is at risk of getting hair lice. Not a pretty picture. Now maybe if আপনি hardly have any hair, maybe once a week is fine. But if আপনি have quite a bit of hair, আপনি need to wash it (at least 2 times in 1 week). I wish আপনি all the best.