Does "white teeth" toothpaste actually make my teeth whiter?
This answer is a draft. It stays unpublished until legal review and source verification are complete.
Toothpastes promising whiter teeth (sold as ホワイトニング, howaitoningu, or 美白, bihaku) stand out on the shelves of Japanese drugstores (Matsumoto Kiyoshi, Welcia, etc.). But a toothpaste can only shift "surface staining". Changing the colour of the tooth itself is dental work, and the two need to be kept apart — especially if you are used to stronger products sold over the counter in your home country.
Ways of making teeth whiter, by category
| Method | Legal position | What it can do | Caution |
|---|---|---|---|
| Toothpaste (cosmetic or quasi-drug — a Japanese category between cosmetics and medicines) | "Makes teeth white" is a permitted claim only in the sense of removing surface stains | Lifts stains and returns teeth to their original colour | Overuse of abrasives damages enamel and gums |
| Professional cleaning at a dentist (PMTC) | Dental care | Removal of tartar and staining | Health-insurance coverage depends on conditions |
| Dental bleaching | Dental care (hydrogen peroxide, carbamide peroxide) | Breaks down pigment inside the tooth, making it whiter than its natural colour | Not covered by insurance (private fee). Can cause tooth sensitivity |
| Overseas bleaching products sold over the counter | May contain ingredients that in Japan may only be used or sold by dentists | — | Consultations reported about gum inflammation from personally imported products |
- Fluoride concentration: toothpaste sold in Japan may contain up to 1,500 ppm (the ceiling was raised in 2017). For preventing tooth decay, the 2023 recommendation from four academic societies including the Japanese Society for Oral Health is 1,000 ppm in a rice-grain to pea-sized amount for children under 6, and 1,500 ppm in a 1.5–2 cm strip for age 6 and over.
- How to brush: twice a day for 2 minutes; put the bristle tips at the line between tooth and gum and move in small strokes. Pressure of 150–200 g (the bristles should not splay) is the guide. Rinsing once with a small amount of water leaves fluoride in the mouth.
- Preventing stains: rinse with water after coffee, tea or red wine; cut down on tobacco. Interdental brush or floss once a day.
- "Howaitoningu" on toothpaste has no legal definition. Within the cosmetics category, the only permitted claim is "makes teeth white" in the sense of removing stains. Adverts saying "bleaches teeth" or "whiter than your natural colour" are a problem under the Pharmaceuticals and Medical Devices Act (Japan's cosmetics and drugs law).
[Verify] Check the fluoride recommendations (joint statement of four societies, 2023) and the brushing-pressure figure against the source documents.
Misunderstanding 1｜Keep using this toothpaste and I will have teeth like a celebrity
Toothpaste can only bring teeth back to their original colour. Going whiter than that is the domain of dental bleaching.
Misunderstanding 2｜More abrasive means whiter
Brushing hard with a highly abrasive product wears away enamel, so the yellowish dentine underneath shows through and teeth can look more yellow. The gums recede too.
Misunderstanding 3｜Rinse thoroughly several times after brushing
To keep fluoride on the teeth, one rinse with a small amount of water is recommended. Rinsing repeatedly washes the fluoride away.
Misunderstanding 4｜Buying a strong overseas bleaching kit online is cheaper
Some products contain hydrogen peroxide at concentrations that only dentists may handle in Japan, and consumer bodies have received complaints of gum inflammation and tooth sensitivity. In Japan, have it done at a dental clinic.
Misunderstanding 5｜Less fluoride is safer for children
The four societies' 2023 statement recommends 1,000 ppm in a small amount even for children under 6. Keeping to the amount (rice grain to pea size) matters more.
---
Sources
- Japanese Society for Oral Health, Japanese Society of Pediatric Dentistry, Japanese Society of Conservative Dentistry and Japanese Society of Gerodontology, "Recommended Use of Fluoride Toothpaste" [フッ化物配合歯磨剤の推奨される利用方法] (2023)
https://www.kokuhoken.or.jp/jsdh/
- Ministry of Health, Labour and Welfare, "Scope of Efficacy or Effects of Quasi-drugs" [医薬部外品の効能又は効果の範囲] (medicated toothpastes)
https://www.mhlw.go.jp/
- Japan Dental Association, "Theme Park 8020: Tooth Bleaching" [テーマパーク8020：歯のホワイトニング]
https://www.jda.or.jp/park/
⚠️ Editorial note: the source URLs above were identified by search. Our working environment cannot reach go.jp domains, so the contents have not been checked against the text. Verify every source before publication and record who checked it and when.
About this article
What we share here are ideas and everyday practices passed down among people living in Japan, together with general information drawn from public sources. They are not official recommendations, and they are not professional instruction. Practices vary between households and regions.
This is general information. Results vary from person to person and depend on your own conditions and surroundings.
Please decide for yourself, using your own judgement, whether any of this suits your situation. We cannot accept responsibility for any damage, loss or injury arising from following this article.
Cosmetics are not medicines and are not meant to diagnose, heal or prevent any condition. If your skin reacts, stop using the product and see a dermatologist.
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