[milsorgen]

I've used my fair share of dyes since my blue haired teenage years and I'm curious as they mention non-professional applications of dye in terms of risk. Does this mean the risk is elevated during the application phase and not the 'wearing' phase of dye use?

>We observed a higher breast cancer risk associated with any straightener use and personal use of permanent dye

[karim79]

Assuming that the application phase leads to permanence I don't really see the difference, yet I get your point. E.g. massaging the dye into the scalp vs a pro not going to deep into the roots.