Both oil straightening and keratin treatments are sometimes described as “temporary straightening,” but they’re different products used differently. If you’re an expat in Tokyo trying to decide between them — here’s the honest comparison.
Are They the Same Thing?
Not exactly. Keratin treatment (Brazilian Blowout and similar) specifically uses keratin protein as the active ingredient, often with a formaldehyde or formaldehyde-free bonding agent, sealed with a flat iron. “Oil straightening” is a looser term used in Japan for treatments that use oil and protein-based formulas — some overlap with keratin, some are different products entirely.
💬 KENJI
“Both oil straightening and keratin treatment share the same fundamental limitation for Tokyo expats: they’re temporary and they break down in humidity. The rainy season (June–July) at 80–90% sustained humidity accelerates that breakdown significantly. Clients who’ve had keratin treatments in Singapore or London often find they last half as long in Tokyo’s summer.”
📸 Send a photo first. Honest assessment. No commitment.
📍 Ginza / Yokohama · English · 中文 · 23 years
Side-by-Side for Tokyo Expats
| Oil Straightening | Keratin Treatment | Japanese Acid Straightening | |
|---|---|---|---|
| Duration | 1–3 months | 2–4 months | Permanent |
| Rainy season performance | Weak | Moderate → weak | Excellent |
| Availability in Tokyo | Common | Limited | Widely available |
My Recommendation for Expats
For expats staying in Japan 6+ months: Japanese acid straightening consistently produces better results for Tokyo’s specific climate than either oil straightening or keratin. For shorter stays or clients who specifically want to keep curl: oil straightening or keratin depending on your hair and preference.
Related: Oil Straightening vs Japanese Straightening → · Keratin Treatment in Japan: Complete Guide →
More in this series: Oil Straightening Disadvantages: 7 Things No Salon Tells You → · オイルストレートと縮毛矯正の違い → · Keratin Treatment in Japan →
KENJI HAIR LOUNGE — GINZA & YOKOHAMA
Not sure which treatment is right for your hair?
Send a photo — honest assessment, no commitment. English · 中文 · 23 years · Singapore
🕙 Tokyo (Ginza): Tue–Sun · 8:30–18:30 · Yokohama: Every Monday · 8:30–18:30
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