This article states 5 reasons why people should not use box dye!

One size does not fit all, Box dye has a basic formula that does not work on every single hair color and type.
It's Terrible for hair, there is a reason why its so cheap, Manufactures use low quality dyes, chemicals, and additives that will damage hair.
Box dyes are are progressive dyes which means everytime its used the pigment will keep building onto its self and create a darker look everytime its applied.
People shouldn't be coloring their hair themselves. Lisenced cosmetologist spend 2000+ hours learning how to do hair. Professionals have formulas and chemistry they have to learn.
Color corrections will always cost more then going to a salon in the first place.

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