Oil straightening and keratin treatment work on completely different principles. Here is the accurate comparison for expats in Tokyo.
The Key Difference
💬 KENJI — Ginza, 23 years
“Keratin deposits protein onto the hair surface — a coating sealed with heat. Oil straightening uses a reducing agent to restructure the internal bonds, the same category as Japanese acid straightening. This is why oil straightening handles strong wave better and holds through Tokyo’s rainy season.”
| Oil Straightening | Keratin Treatment | |
|---|---|---|
| Principle | Reducing agent + iron (internal) | Protein coating + heat (surface) |
| Straightens strong wave? | ◎ (product-dependent) | △ reduces frizz only |
| Tokyo rainy season | Generally good | Coating breaks down |
| Duration | Varies by product | 2–4 months (washes out) |
If you have strong wave wanting consistent straightening — oil straightening gives a more thorough result than keratin. If you want to keep natural curl but reduce frizz and are in Japan short-term, keratin may be appropriate.
Related: Oil Straightening Disadvantages → · What Is Oil Straightening? → · Keratin Treatment in Japan →
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