It wouldn't matter, you could use the truzone, but you don't use both. So yeah, the kit has peroxide, there's no need for the truzone peroxide. But, to be fair, they might not have meant a kit and peroxide, she might have meant bleach powder and you didn't realise? I don't know, I wasn't there, obviously. I'm not saying we're all knowing, but we deal with a lot of people who have had bad advice from Sally's.
An awful lot of the staff at Sally's have little idea what they're talking about unfortunately.