MASHIRO
MASHIRO 药用美白粉，30克（草本薄荷味）
MASHIRO 药用美白粉，30克（草本薄荷味）
@cosme rating: 4.4/7.0
A Japanese quasi-drug whitening tooth powder that lifts coffee, tea, and wine stains from daily use — without the enamel damage that comes with most whitening toothpastes.
✓ 100% authentic
✓ Ships from Japan in 3-5 days
✓ Duties prepaid for US orders
✓ Tracked delivery via Japan Post
无法加载取货服务可用情况
What it is
MASHIRO颠覆了人们对美白牙膏的固有印象。这个紧凑、屡获设计大奖的罐子里装的不是糊状物，而是绿色粉末——这正是其精妙之处。粉末所含的清洁剂是牙膏的两倍，却不会过于浓稠而难以使用，因此每次刷牙都更有效。其微米级二氧化硅颗粒直径仅为10微米或更小，足够细腻，可在不刮伤牙釉质的前提下去除牙渍。它起泡轻柔，易于冲洗干净，也不会留下那种人工薄荷覆盖的异味，让您刷牙后的咖啡味道变差。一罐可用约100次——相当于两到三个月的日常刷牙量——其价格更是让专业的牙齿美白疗程显得不那么划算。
Ingredients
(1) 微米级二氧化硅（無水ケイ酸）：超细清洁颗粒，安全去除牙渍
(2) 焦磷酸钙（ピロリン酸Ca）：高效美白剂，针对牙齿泛黄
(3) 甘草酸二钾（グリチルリチン酸2K）：甘草提取的活性成分，减少牙龈炎症
(4) 醋酸生育酚（酢酸トコフェロール）：维生素E，支持牙龈血液循环
(5) 铜叶绿素钠（銅クロロフィリンNa）：叶绿素，赋予粉末绿色并有助于中和口臭
Cleaning agent: Silica, calcium pyrophosphate Solvent: Water, PEG-8, BG, ethanol Wetting agent: Concentrated glycerin, sodium hyaluronate-2 Foaming agent: Sodium lauryl sulfate Binder: Crystalline cellulose pH adjuster: Sodium polyphosphate, sodium carbonate Flavoring agent: Fragrance (herbal mint type) Sweetener: Stevia extract, xylitol Dipotassium glycyrrhizinate, tocopherol acetate Adsorbent: β-cyclodextrin Refreshing agent: Menthol, clove oil Colorant: Copper chlorophyllin sodium Preservative: Paraben, phenoxyethanol
How to use
盖上盖子，倒置瓶身，摇晃两到三次，直到粉末聚集在内盖中。将干燥的牙刷按入盖子。像往常一样刷牙，重点清洁染色区域。彻底漱口。每天使用一次以进行维护，或在针对较重染色时每天使用两次。
We ship internationally from Japan!
Frequently Asked Questions
Is this authentic?
Yes. We only buy from official retailers and directly from the brands here in Japan. Never resellers, never grey market stock.
We are beauty lovers too, so we know the worry, especially with something you are putting on your face. Authenticity is 100% guaranteed by us.
What are your shipping rates?
On orders under US$75, shipping is a flat US$20 to the United States and US$10 to all other countries.
Orders of US$75 or more ship free, applied automatically at checkout. Your exact shipping cost is shown before you pay.
How long does delivery take?
These estimates are for International Airmail (Tracked) and include 3 to 5 business days of processing in Japan.
- United States: 12 to 15 business days
- Canada, United Kingdom, France, Germany: 9 to 12 business days
- Australia, New Zealand, Denmark, Finland, India, Indonesia, Italy, Netherlands, Spain, Sweden, Switzerland: 10 to 13 business days
- China, Hong Kong, Malaysia, Singapore, South Korea, Taiwan, Thailand, Vietnam: 8 to 10 business days
- Rest of the world: 11 to 18 business days
Actual delivery can be affected by customs clearance, seasonal congestion, or carrier delays in the destination country, all of which are outside our control.
Do you offer express shipping?
Yes. As of 22 July 2026, we offer International Express Mail through Japan Post. The cost is based on order weight and is calculated automatically at checkout.
Will I pay customs or import fees?
US orders: No. As of July 1, 2026, all US orders ship DDP (duties delivered prepaid), meaning we prepay all import duties on our end. Nothing is due at your door.
Orders outside the US: Possibly. Duties and import taxes are set by your local customs authority and are not collected at checkout, so any charges on delivery are your responsibility.
We're working on rolling out prepaid duties for more countries soon.
I was surprised. I've tried several toothpastes that claim to whiten, but I didn't really see any results. However, just one use of this one made a huge difference. I was concerned about the pigmentation at the joints between my post-treatment teeth and my original teeth, but this one whitened my teeth overall, and the joints that bothered me faded after just one use. If it's so effective after just one use, it seems like it would be better value for money to use this one regularly than to buy other toothpastes, even if they're more expensive. The flavor is not much different from regular mint, so it's easy to use.
I tried MASHIRO Herb Mint 30g (1,800 yen) toothpaste with whitening properties that I bought at Loft. It doesn't foam much, so you can take your time brushing, and it leaves your teeth feeling smooth and comfortable! It's also made in Japan, so you can rest assured. The container is stylish, so maybe I'll buy the pink pomegranate mint next?
I used it as a test, and my teeth are so much smoother! It also seems to have a whitening effect, so I'll continue to use it.
I received MASHIRO Tooth Powder Herb Mint Flavor from Sumoka Toothpaste Co., Ltd. (@mashiro_tp). Unlike previous whitening products, MASHIRO is a toothpaste designed to both whiten and maintain healthy teeth. Its ultra-fine micro-silica particles remove stains while being gentle on teeth. It contains calcium pyrophosphate, which has excellent whitening properties. It effectively removes stubborn stains and yellowing from coffee and tea. Chlorophyll suppresses bad breath, while vitamin E and GA2 prevent periodontal disease for a dual effect. Daily brushing also effectively combats cavities. One 30g bottle contains enough for approximately 100 uses. The stylishly designed packaging makes it perfect for the bathroom. The mild mint flavor is ideal for those who don't like harsh toothpastes. I noticed a stevia-like aftertaste after brushing, perhaps due to the herb in the herb. It doesn't immediately alter the taste of drinks or food even after brushing. The large capacity means it's quite useful. I'd like to know the correct way to apply it to a toothbrush.
It never runs out. It's a powder toothpaste that lasts for a long time, even if you use it over and over again. It's a little more time-consuming than a tube, so it seems unsanitary to scoop it up with a wet toothbrush. However, when I use a dry toothbrush, a green powder falls onto the sink. What should I do about this? I always wonder. My teeth become incredibly smooth.