Just that really. I’ve had my hair exclusively dyed in the salon for the last year after decades of box dyes. I’m really grey and my roots show after about 3 weeks, and I can’t be dealing with the time and expense of salon touch ups every months.
Every hairdresser practically breaks out in hives whenever box dye is mentioned and talk about how “awful” it is. Is it really that bad? Surely there’s very little difference between shop bought and what they use in salons, or do they just make out that there is to get you to keep spending money in the salon?