MASHIRO Medicated Whitening Powder, 30g (Herb Mint)

(1) Micro-silica at 10 microns or less removes surface stains without scratching enamel
(2) Two regulated active ingredients target gum inflammation and support circulation
(3) One 30g jar lasts approximately 100 uses — 2 to 3 months of daily use

MASHIRO flips the script on what a whitening toothpaste can look like. The compact, design-award-winning jar contains a green powder — not paste — which turns out to be the whole point. Powder can hold nearly double the cleaning agents of paste without getting too dense to use, so each brush genuinely does more. The micro-silica particles are sized at 10 microns or less, fine enough to lift staining without scratching the enamel underneath. It foams lightly, rinses clean, and does not leave that artificial mint-coated feeling that makes your post-brush coffee taste wrong. One jar lasts about 100 uses — two to three months of daily brushing — at a price that makes professional whitening sessions feel hard to justify.

(1) Micro-Silica (無水ケイ酸): ultra-fine cleaning particles that polish away stains safely
(2) Calcium Pyrophosphate (ピロリン酸Ca): high-whitening-power agent targeting yellowing
(3) Dipotassium Glycyrrhizate (グリチルリチン酸2K): licorice-derived active that reduces gum inflammation
(4) Tocopherol Acetate (酢酸トコフェロール): Vitamin E that supports gum circulation
(5) Sodium Copper Chlorophyllin (銅クロロフィリンNa): chlorophyll that gives the powder its green color and helps neutralize bad breath

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 Active ingredients: Dipotassium glycyrrhizinate, tocopherol acetate Adsorbent: β-cyclodextrin Refreshing agent: Menthol, clove oil Colorant: Copper chlorophyllin sodium Preservative: Paraben, phenoxyethanol

Close the lid, flip the jar, and shake two to three times until powder collects in the inner lid. Press a dry toothbrush into the lid. Brush as normal, focusing on stained areas. Rinse thoroughly. Use once daily for maintenance, or twice daily when targeting heavier staining.

Q: Does the MASHIRO Medicated Whitening Powder contain fluoride?
A: No, MASHIRO does not contain fluoride. If fluoride is important to your routine, you may want to use MASHIRO alongside a fluoride toothpaste rather than as a full replacement.
Q: How do I apply the powder without it going everywhere?
A: Close the lid, flip the jar upside down, and shake it gently two to three times. The powder collects in the inner lid. Press a dry toothbrush into the lid and the powder clings to the bristles. Using a wet brush beforehand makes it fall off — dry brush is key.
Q: Is it safe on fillings, crowns, or implants?
A: The brand recommends checking with your dentist if you have restorations. The formula is gentle on natural enamel, but compatibility with dental materials varies. The full ingredient list is on the official MASHIRO website.
Q: How quickly does it work?
A: Most people notice teeth feeling smoother and looking brighter within the first few uses. Older or deeper staining takes longer — typically a few weeks of consistent daily use to see a meaningful difference.
Q: Why is the powder green?
A: The green comes from sodium copper chlorophyllin, a chlorophyll-derived ingredient that also helps prevent bad breath. It is not just for looks — it is one of the active components in the formula.