everyday. if i don't do this, my roots get greasy (and believe it or not, i always have an extremely active sleep, so during the night i sweat like hell, so it makes them greasier), my ends get dry and i loose all the volume i had the day before. besides, i have fine hair, so the natural oil in my hair can make it look greasy when it wouldn't on normal hair. grrr, i hate greasy hair.