Skip to content
The RŌZ Guide · Hair Concerns

Hair concerns, explained by cause.

Eight evidence-backed guides for dry hair, frizz, damage, split ends, build-up, color-treated hair, oily scalp, and heat damage. Start with what you're noticing, trace the likely cause, then choose the right routine — including where RŌZ is not the answer.

Browse all concerns Take the 60-second diagnostic
At a glance
Concerns covered
8
Reviewed by dermatologist
2
Clinical citations
12
Interactive diagnostics
14
Last updated
Filter by concern Hair type
In this hub
Quick answers

The eight questions we hear most at the chair.

How do I know which concern applies to me when it feels like all of them?
Start with the most visible symptom. Frizz is texture; dry hair is feel; damage is integrity; oily is scalp. Take the 60-second diagnostic if the symptoms overlap — most people land in two concerns, and the guide tells you which one to fix first.
Can I use RŌZ for all of these?
Not all. We're built for frizz, dry, heat, and color-preserve. We're not a bond repair, we're not a medical scalp treatment, and we're not a sebum regulator. Each guide says explicitly where we aren't the answer — and who is.
How often should I update my routine?
Seasonally, and when your water changes. Move apartments, get a shower filter, change your coloring cadence — any of those is a reason to rerun the diagnostic. Your hair isn't one problem forever.
Do I need a different shampoo for every concern?
Usually no. Foundation Shampoo works across frizz, dry, color-treated, and heat. Oily and heavy build-up are the two exceptions — oily may need a different cleansing cadence, and build-up needs Salt Scalp Scrub's gentle exfoliation before a shampoo switch.
Is sulfate-free enough for color-treated hair?
It's the baseline, not the flex. The rest is silicone strategy, heat exposure, and how hard your water is. The color-treated guide walks through all four.
What do you mean by "honest alternative"?
A callout card inside the article that names a non-RŌZ product as the right answer, with the reason and the mechanism. K18 for bond repair. Malibu C for mineral build-up. A good haircut for split ends. We only recommend RŌZ where it fits.
Who wrote this content?
Most concern guides are produced by the RŌZ editorial team and reviewed against primary dermatology literature (Gavazzoni Dias 2015, Robbins 2012, AAD consumer guidance). Mara's byline is reserved for pages where her working-stylist judgment is the source material.
What if my concern isn't one of the eight?
Ask Mara. Submit a question and we'll either answer it directly or add a guide. The eight we started with cover the questions we hear most often; the rest we handle case-by-case in Ask Mara.