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How important is it that the brands of your shampoo and conditioner match up?
(About to use matching Treseme shampoo and conditioner after I finish other crap... not much left)
No importance to you at all, unless you find it makes a noticeable difference.
To the manufacturer? Very important that you buy as many products of theirs as they can sell you.
In most cases its not that important, yet for example if your using the mop c system range which is all about organically derived ingredients it would make no sense to use the poo' and then some other cond, since the poo' is made for use inconjunction with the cond since its sulphate free and the cond it very light to compensate. But most other cases I can think of it doesnt matter, and actually ma be better off not using them both if one is inferior.
I was looking at Tresseme the other day in the shop, I actually like the ingredients on it, the vit E poo' looks pretty decent for a daily poo and for the amount you get! here its on special offer buy one get one free. The cond looked decent too I think, I never bought them cos ive still got millions to use in my bathroom, maybe when my tigi runs out i'll try the tresseme.