Can you dye hair twice in one day?

Yes, I died my hair 5 times over 4 days in a row, and my hair is perfectly fine! (fine as in good condition). But consider the condition of your hair, is it already dry and split? or is your hair neutrally thin? If so, it isn't recommended. But don't bother asking your hair dresser because they always have to be safe, otherwise they can loose their job..... so, if your hair is in reasonably good condition, then yeah two dies won't do much other then change the colour!:)

Just make sure you condition well (I usually do it twice after I've coloured).

Hope I helped:)

P.s, if you want to die it PERMANENT twice in one day, then after you've coloured it once permanently, you need to buy something from Lorilee or John Frida that is designed to remove the die. Otherwise, the next permanent colour, won't work!

Hope I helped:)